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	<title>Walkabout &#187; Too Cool</title>
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	<link>http://wading-in.net/walkabout</link>
	<description>What do you find when you take the time to look?</description>
	<lastBuildDate>Mon, 21 May 2012 04:02:59 +0000</lastBuildDate>
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		<title>Showoff</title>
		<link>http://wading-in.net/walkabout/2012/05/showoff/</link>
		<comments>http://wading-in.net/walkabout/2012/05/showoff/#comments</comments>
		<pubDate>Mon, 21 May 2012 03:20:22 +0000</pubDate>
		<dc:creator>Al Denelsbeck</dc:creator>
				<category><![CDATA[Astronomy]]></category>
		<category><![CDATA[Frustrations]]></category>
		<category><![CDATA[Nature]]></category>
		<category><![CDATA[Photography]]></category>
		<category><![CDATA[Too Cool]]></category>
		<category><![CDATA[annular eclipse 2012]]></category>
		<category><![CDATA[James L. Kramer]]></category>
		<category><![CDATA[Kansas]]></category>
		<category><![CDATA[solar eclipse]]></category>

		<guid isPermaLink="false">http://wading-in.net/walkabout/?p=8016</guid>
		<description><![CDATA[<p>So yeah, I&#8217;m well outside of the range of the annular eclipse, still taking place as I type this I believe, and my friend in Kansas thought he was too. But at least he was watching carefully at sunset when he got the right conditions.</p> <p> No filters needed when it&#8217;s this low on [...]]]></description>
			<content:encoded><![CDATA[<p>So yeah, I&#8217;m well outside of the range of the annular eclipse, still taking place as I type this I believe, and my friend in Kansas thought he was too. But at least he was <a href="https://www.facebook.com/media/set/?set=a.453286464684984.120377.100000109032145&#038;type=1&#038;l=3440980aab" target="_blank">watching carefully at sunset when he got the right conditions</a>.</p>
<p><a href="https://www.facebook.com/media/set/?set=a.453286464684984.120377.100000109032145&amp;type=1&amp;l=3440980aab" target="_blank"><img src="http://wading-in.net/walkabout/wp-content/uploads/2012/05/JimEclipse.jpg" alt="" title="JimEclipse" width="730" height="827" class="alignleft size-full wp-image-8017" /></a><br clear="all"/><br />
No filters needed when it&#8217;s this low on the horizon, since the atmosphere cuts the light levels down to manageable levels. Notice how the sun broke from underneath the cloud cover to make its brief appearance, by my estimate for less than 200 seconds.</p>
<p>Around here in North Carolina, the haze is usually too great to see anything within a few degrees of the horizon, and my only clear vantages that low generally have things like the interstate in the foreground. Typically, every meteorological event that&#8217;s come up in the past several months, including just plans to use the full moon two weeks ago as a light source for long exposures, has been trashed by bad weather. We&#8217;ve even had several electrical storms, all obscured by low clouds to prevent any lightning pics.</p>
<p>So yes, Jim, I hate you.</p>
<p><a href="https://www.facebook.com/media/set/?set=a.453286464684984.120377.100000109032145&amp;type=1&amp;l=3440980aab" target="_blank"><img src="http://wading-in.net/walkabout/wp-content/uploads/2012/05/JimEclipse2.jpg" alt="" title="JimEclipse2" width="730" height="616" class="alignleft size-full wp-image-8018" /></a></p>
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		<title>Too cool 14: Up close with the shuttle</title>
		<link>http://wading-in.net/walkabout/2012/05/too-cool-14-up-close-with-the-shuttle/</link>
		<comments>http://wading-in.net/walkabout/2012/05/too-cool-14-up-close-with-the-shuttle/#comments</comments>
		<pubDate>Fri, 18 May 2012 21:19:03 +0000</pubDate>
		<dc:creator>Al Denelsbeck</dc:creator>
				<category><![CDATA[Astronomy]]></category>
		<category><![CDATA[Photography]]></category>
		<category><![CDATA[Too Cool]]></category>
		<category><![CDATA[Kevin Burke]]></category>
		<category><![CDATA[launch camera]]></category>
		<category><![CDATA[Matt Melis]]></category>
		<category><![CDATA[Mobile Launcher Platform]]></category>
		<category><![CDATA[NASA]]></category>
		<category><![CDATA[Pad 39-A]]></category>
		<category><![CDATA[slidewire escape]]></category>
		<category><![CDATA[Space Shuttle Orbiter]]></category>

		<guid isPermaLink="false">http://wading-in.net/walkabout/?p=7981</guid>
		<description><![CDATA[<p>Okay, first off, I apologize to those whose attention span will not be able to handle a 45 minute video &#8211; I know, this is the internet, the TL;DR Channel, where three minutes is a chore. Chill out, get a Pepsi or some tea, and stay on the same page for a bit (it&#8217;ll [...]]]></description>
			<content:encoded><![CDATA[<p>Okay, first off, I apologize to those whose attention span will not be able to handle a 45 minute video &#8211; I know, this is the <em>internet</em>, the TL;DR Channel, where three minutes is a chore. Chill out, get a Pepsi or some tea, and stay on the same page for a bit (it&#8217;ll make me happier when looking at the site stats, too.)</p>
<p>Second, I&#8217;m really sorry they didn&#8217;t do this sooner, before the space shuttle orbiter was scheduled for retirement, because it adds a lot more interesting detail to the whole launch process. What I&#8217;m featuring here is a collection of clips during a couple of shuttle launches, taken by some of the 125+ cameras that keep track of various factors from very distinct vantage points, most of them at high-speed frame rates which provide excellent detail. You can watch the main engines ignite from front row, and actually see the explosive bolts that hold the solid rocket boosters in place on the pad fire off and release. And throughout it all are quite a few details about the cameras themselves and how they operate. Below, I include a short glossary of the abbreviations used by the narrators.</p>
<p>My one regret is that they didn&#8217;t either rehearse (and perhaps edit) the voice-overs, or perhaps obtain some professional voice actors. While it means a lot to have two NASA engineers explaining everything we can see, it comes off a tad unpolished. Still, I think most viewers can handle the video without the need for some infomercial-style enthusing.</p>
<p>Also note, there&#8217;s an HD version out there, but I had several issues with it pegging out, so I&#8217;m featuring the <a href="http://youtu.be/W2VygftZSCs" target="_blank">lower-res version here</a>.</p>
<p><iframe width="640" height="360" src="http://www.youtube.com/embed/W2VygftZSCs" frameborder="0" allowfullscreen></iframe></p>
<p>Glossary of abbreviations<br />
FSS &#8211; Fixed Service Structure (&#8220;launch tower&#8221;)<br />
KTM &#8211; Kineto Tracking Mount (<a href="http://en.wikipedia.org/wiki/File:Contraves-Goerz_Kineto_Tracking_Mount.jpeg" target="_blank">great pic here</a>)<br />
LCC &#8211; Launch Control Complex (&#8220;mission control&#8221;)<br />
MLP &#8211; Mobile Launcher Platform<br />
RCS &#8211; Reaction Control System (maneuvering rockets)<br />
SSME &#8211; Space Shuttle Main Engines<br />
SRB &#8211; Solid Rocket Booster<br />
TSM &#8211; Tail Service Mast</p>
<p>Here&#8217;s a couple of little bits of trivia. Throughout the video, you&#8217;ll notice the extensive use of water, not for cooling and protecting the launch area as one might expect, but for &#8220;sound suppression.&#8221; The thrust of the engines and boosters hitting the launch platform can actually send shock waves back up to the vehicle, potentially damaging it, so the water serves to dissipate the worst effects of the thrust. Also, note that when you see a launch producing huge gouts of smoke, bear in mind that the white clouds are not smoke, but steam (okay, pedants, water vapor) from this suppression system. The SRBs produce grey smoke, and the SSMEs produce none at all.</p>
<p>Also, the entire launch vehicle of shuttle, external tank, and solid rocket boosters are attached to the MLP (and transported) by just four bolts on the bottom of each SRB, the ones you see separating by small explosions as the boosters ignite. They boosters are placed onto the platform first and bolted down, then the external tank fitted between them, and the shuttle orbiter attached to that. The solid boosters are the only things not actually empty when this takes place &#8211; all other fueling and payload placement occurs after the launch platform has reached the FSS on the pad. For years, I thought the Tail Service Masts, those big blocks that sit at the base of the orbiter&#8217;s wings, served to hold the orbiter in place since it was so offset from the apparent center of gravity, but all they do is provide propellent and electrical connections to the SSMEs and RCS.</p>
<p>In the video, they mention the long-distance camera tracking stations situated miles away from the launch pad. When I lived in Florida, I was aware of one of them to the south, next to Patrick Air Force Base, so I went looking for the one to the north. Near as I can tell, it can be found by putting &#8220;28.702876 N 80.668605 W&#8221; into Google Maps, Bing, whatever. Thy look like miniature observatory domes. The one near Patrick is at &#8220;28.227168 N 80.599659 W&#8221;. Somewhere south of Cocoa is another, abandoned one that I have to try and find again.</p>
<p><img src="http://wading-in.net/walkabout/wp-content/uploads/2012/05/FSS.jpg" alt="" title="FSS" width="730" height="427" class="alignleft size-full wp-image-7986" /><br clear="all"/><br />
By the way, the Fixed Service Structures on pads 39-A and 39-B, seen here in a pic from the wildlife refuge north of the Cape in 2004, are gone now, dismantled to be replaced by structures dedicated to the new Space Launch System, not unlike the old Saturn V system that carried astronauts to the moon (and Skylab into Low Earth Orbit.) And the <a href="http://wading-in.net/walkabout/2011/02/the-vab/" target="_blank">Vehicle Assembly Building</a> is going through a <a href="http://www.time.com/time/health/article/0,8599,2114910,00.html" target="_blank">major overhaul</a> inside for the same purpose &#8211; try to imagine that task. But if you really want something to imagine, there&#8217;s this<strong>:</strong></p>
<p><img src="http://wading-in.net/walkabout/wp-content/uploads/2012/05/Escape.jpg" alt="" title="Escape" width="730" height="307" class="alignleft size-full wp-image-7987" /><br clear="all"/><br />
Can you make out those faint wires stretching across the frame from the FSS? (Gimme a break &#8211; I was 3.5 kilometers away.) Those are one of the many crew escape options for shuttle launches. In the event that the crew could egress the shuttle by gantry but the FSS was compromised, for instance by a ground fire, they would have jumped into little baskets attached to those wires and slid down to the ground, whereupon they could then enter some modified M113 Armored Personnel Carriers and tool their way to safety (probably after pulling some donuts and trying to find an abandoned car to run over.) But hey, you don&#8217;t have to imagine it, because NASA was kind enough to take excellent video of the final release of these escape baskets. Trust me, I was grinning stupidly for the second half of <a href="http://youtu.be/TGMWdtQYkbc" target="_blank">this</a><strong>:</strong></p>
<p><iframe width="640" height="360" src="http://www.youtube.com/embed/TGMWdtQYkbc" frameborder="0" allowfullscreen></iframe></p>
<p>Yes, that&#8217;s the VAB you can see in the distance. Many thanks to NASA for such great perspectives!</p>
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		<title>&#8230; and part two</title>
		<link>http://wading-in.net/walkabout/2012/04/and-part-two/</link>
		<comments>http://wading-in.net/walkabout/2012/04/and-part-two/#comments</comments>
		<pubDate>Sun, 29 Apr 2012 05:37:59 +0000</pubDate>
		<dc:creator>Al Denelsbeck</dc:creator>
				<category><![CDATA[Continued from other blogs]]></category>
		<category><![CDATA[Science & Evolution]]></category>
		<category><![CDATA[Too Cool]]></category>
		<category><![CDATA[CERN]]></category>
		<category><![CDATA[Daniel Whiteson]]></category>
		<category><![CDATA[Higgs boson]]></category>
		<category><![CDATA[Large Hadron Collider]]></category>
		<category><![CDATA[LHC]]></category>
		<category><![CDATA[particle physics]]></category>
		<category><![CDATA[PhD Comics]]></category>

		<guid isPermaLink="false">http://wading-in.net/walkabout/?p=7775</guid>
		<description><![CDATA[<p>There are actually two themes I&#8217;m continuing here. The first is the limits of our knowledge, which is a &#8220;half-empty&#8221; perspective; there&#8217;s a better way of expressing it, which we&#8217;ll get to in a moment. The second theme being continued here is special efforts made by scientists to communicate their work to the general [...]]]></description>
			<content:encoded><![CDATA[<p>There are actually two themes I&#8217;m continuing here. The first is the limits of our knowledge, which is a &#8220;half-empty&#8221; perspective<strong>;</strong> there&#8217;s a better way of expressing it, which we&#8217;ll get to in a moment. The second theme being continued here is special efforts made by scientists to communicate their work to the general public. The previous example (last post) was an individual contribution, though also connected to the student exercises linked to earlier at the <a href="http://multipleorganisms.net/" target="_blank"><em>MultipleOrganisms.net</em></a> site. This one is aimed directly at public consumption, and does a remarkable job in a very short space of time.</p>
<p>It&#8217;s very likely that you&#8217;ve heard of the <a href="http://public.web.cern.ch/public/en/lhc/lhc-en.html" target="_blank">Large Hadron Collider</a> (or LHC) at CERN, possibly because of the vapid concerns over it destroying the earth that gained far more media attention than was warranted. It&#8217;s also likely that you have no idea what it is that they&#8217;re trying to do, or that you know it has something to do with the &#8216;Higgs Boson&#8217; but aren&#8217;t sure exactly what. If so, this <a href="http://www.phdcomics.com/comics.php" target="_blank">short video animation</a> will almost certainly help<strong>:</strong><br />
<iframe src="http://player.vimeo.com/video/41038445?portrait=0&amp;color=c8b3df" frameborder="0" width="500" height="656"></iframe></p>
<p>[<a href="http://vimeo.com/41038445">The Higgs Boson Explained</a> from <a href="http://vimeo.com/phdcomics">PHD Comics</a> on <a href="http://vimeo.com">Vimeo</a>].</p>
<p>As far as I&#8217;m concerned, this is a very effective presentation. Nothing fancy or flashy needed &#8211; just a good narrator and some visual assistance.</p>
<p>The underlying message is interesting, too &#8211; this is a realm of science that is wide open for surprises and new discoveries, and it highlights how much we still have yet to learn. In the past century, we explored nearly all of our planet&#8217;s surface and turned our eyes to the stars, reaching farther and farther out &#8211; but another faction of explorers started reaching farther and farther inwards, delving into realms that continue to get even smaller. The very word &#8220;quantum&#8221; is a reference to the smallest possible amount that something could be reduced to. The first written concepts of this considered everything to be made of five perfect geometric shapes &#8211; this was a few thousand years ago. Much later on, we figured out that everything was made of atoms, a word that means something that cannot be divided or reduced further. The name stuck, the supposed property didn&#8217;t, as we discovered the bits that atoms are made of. And while doing all this, we narrowed down the four basic forces which govern all matter &#8211; so far, anyway.</p>
<p>It&#8217;s fairly common knowledge now that quantum physics has rules all its own, surprisingly different from standard physics, and it&#8217;s been a huge field of study. At the subatomic level, matter doesn&#8217;t act as it does &#8216;normally,&#8217; and we still don&#8217;t know why, nor how particles that behave one way form a collective atom that behaves another. There is at least one fundamental law governing this, probably more, and it&#8217;s very likely that once we find out about it all, there will be numerous new applications in materials, communication, and potentially even travel and energy.</p>
<p>It&#8217;s very easy to ask questions about how or why this is important, especially in the face of more immediate concerns locally or worldwide. Yet, roughly a century ago when some of the most astounding findings of both particle physics and astronomy were made, there were countless immediate concerns too, like The War To End All Wars and anarchists in the US. They&#8217;re long past now, but the science remains. We have a serious problem with repeating history, yet <em>knowledge</em> moves forward constantly, and the LHC stands a good chance of being the location where another leap occurs. There&#8217;s a lot still to be discovered, and for those who favor the ideas of exploration and learning, it really is pretty damn cool.</p>
<p style="text-align: center;">
*      *      *      *</p>
<p><font size="-1">Thanks to <a href="http://blogs.discovermagazine.com/cosmicvariance/" target="_blank"><em>Cosmic Variance</em></a> for the initial introduction to the video, and <a href="http://vimeo.com/phdcomics" target="_blank"><em>PhD Comics</em></a> for their great efforts to communicate these things effectively.</font></p>
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		<title>That&#8217;s 154 to you and me</title>
		<link>http://wading-in.net/walkabout/2012/04/thats-154-to-you-and-me/</link>
		<comments>http://wading-in.net/walkabout/2012/04/thats-154-to-you-and-me/#comments</comments>
		<pubDate>Tue, 24 Apr 2012 11:00:22 +0000</pubDate>
		<dc:creator>Al Denelsbeck</dc:creator>
				<category><![CDATA[Astronomy]]></category>
		<category><![CDATA[Photography]]></category>
		<category><![CDATA[Science & Evolution]]></category>
		<category><![CDATA[Too Cool]]></category>
		<category><![CDATA[Cats Eye nebula]]></category>
		<category><![CDATA[dark energy]]></category>
		<category><![CDATA[exoplanets]]></category>
		<category><![CDATA[Hubble Space Telescope]]></category>
		<category><![CDATA[planet formation]]></category>
		<category><![CDATA[Ultra Deep Field]]></category>

		<guid isPermaLink="false">http://wading-in.net/walkabout/?p=7744</guid>
		<description><![CDATA[<p><p class="wp-caption-text">Source: Hubblesite.org</p> On this date 22 years ago, the Hubble Space Telescope was borne into space on Shuttle Discovery, the one that recently did its last flyby over DC (well, okay, it had help) before delivery to the Udvar-Hazy center. The Hubble will be retired soon, and while this is viewed with some [...]]]></description>
			<content:encoded><![CDATA[<p><div id="attachment_7745" class="wp-caption alignleft" style="width: 650px"><a href="http://hubblesite.org/gallery/wallpaper/" target="_blank"><img src="http://wading-in.net/walkabout/wp-content/uploads/2012/04/hs-2004-27-a-640_wallpaper.jpg" alt="The Cat&#039;s Eye Nebula: A Dying Star Creates a Sculpture of Gas and Dust" title="hs-2004-27-a-640_wallpaper" width="640" height="480" class="size-full wp-image-7745" /></a><p class="wp-caption-text">Source: <a style='color:#686868;font-style: italic;' href='http://hubblesite.org' target='_blank'>Hubblesite.org</a></p></div><br clear="all"/><br />
On this date 22 years ago, the <a href="http://hubblesite.org" target="_blank"><strong>Hubble Space Telescope</strong></a> was borne into space on Shuttle Discovery, the one that recently did its last flyby over DC (well, okay, it had help) before delivery to the <a href="http://www.nasm.si.edu/udvarhazy/" target="_blank">Udvar-Hazy center</a>. The Hubble will be retired soon, and while this is viewed with some disappointment by everyone who has even a faint interest in astronomy, it&#8217;s not like anyone can complain. The images alone have been stunning, revealing a universe that is fascinating in its complexity and variety &#8211; but this is a little of a mixed blessing, too. I&#8217;m not alone in wondering how breathtaking it would be to travel to some of these cosmic locations like the Cats Eye Nebula (NGC 6543) above, diving through its diaphanous bubbles like a stormchaser circling the eye of a hurricane, but let&#8217;s face it &#8211; we&#8217;re virtually guaranteed never to be able to do something of this sort. The distances are just too vast [you are required by law to use the word "vast" when talking about space], the energy and time required far beyond the reach of our human efforts. And we are restricted to one vantage point as well, save for three-dimensional renditions by clever programmers. Yet, we also have to temper this with the knowledge that getting too close to some of these distant neighbors would be, <a href="http://youtu.be/jyaLZHiJJnE" target="_blank">as they say</a>, &#8220;bad.&#8221; We&#8217;re not getting these light shows at this distance because of a laser in a smoky disco.</p>
<p>Yet, being the source of pretty pictures is the superficial way to look at Hubble, like judging someone by their shoes. We have obtained a tremendous amount of information from these optical observations as well, such as refining the measurements that led to the concept of &#8220;dark energy.&#8221; In a nutshell<strong>:</strong> after the initial acceleration of all the mass in the universe from a very small point, gravity should have been slowing things down, dragging its metaphorical feet against the coasting bike of space-time (no, I&#8217;ll never be asked to write popular science articles.) Instead, the expansion of the universe is accelerating, and something must be feeding energy into this. I could have continued the space-time bike simile by comparing it to going downhill, but <em>that</em> acceleration is caused be gravity and I&#8217;m now confusing the hell out of even myself. <a href="http://hubblesite.org/hubble_discoveries/dark_energy/" target="_blank">Let&#8217;s let someone else do this</a> (autoplay video at that link &#8211; I wish people would stop doing crap like that.)</p>
<p>Hubble has also contributed a lot to our knowledge of planetary formation, as well. The photos that I <a href="http://wading-in.net/walkabout/2011/03/too-cool-part-nine-a-star-is-born/" target="_blank">highlight in this post</a> disproved a prediction by astronomers that planetary discs would typically remain hidden from our view by surrounding dust clouds. Hubble has even imaged a <a href="http://hubblesite.org/newscenter/archive/releases/2008/39/video/a/" target="_blank">planet itself</a> around another star, something that is remarkably hard to accomplish<strong>:</strong><br />
<script type="text/javascript" src="http://hubblesite.org/lib/share_video.php?u=/hu/db/videos/hs-2008-39-a-flash_video_16x9.flv&amp;t=/hu/db/2008/39/videos/a/flash_preview.jpg&amp;w=448&amp;h=252"></script><br clear="all"/><br />
There&#8217;s a little bit of trivia that is worth knowing, if you&#8217;ll permit me to return to the idea of Hubble as a camera (just try and stop me!) The bare truth is, every camera, every method that we have of producing images from light, fudges things a bit. Film emulsions contain metals that change their nature when exposed to light, forming crystals, and digital sensors generate a difference in electrical charge. But neither of these can determine the difference between wavelengths except in a very broad range, mostly what we call visible light &#8211; in other words, they cannot differentiate color. To accomplish this, they must filter light through substances that permit only specific wavelengths<strong>;</strong> in film, that&#8217;s the emulsion base, a colored gel in which the metals are suspended, and in digital, it&#8217;s a membrane over top of the digital sensor. It&#8217;s no different for the  Hubble Space Telescope, which has colored filters that can be interchanged over its own digital sensors. Every color image from Hubble is a composite of several strictly monochrome images sent back to earth, edited to reintroduce the color, and in most cases enhanced to increase the contrasts between them. A typical computer display does not even remotely approach the range of light and color that our eyes can see, so to provide a better idea of the subtle differences within any photographic target of the HST, the images must be altered. It&#8217;s no different than any image I produce myself and put here on the site. <a href="http://hubblesite.org/newscenter/press_resources/skytel200209028034.pdf" target="_blank">This article from <em>Sky &#038; Telescope</em> magazine</a>, used with permission by Hubblesite.org, explains it in more detail.</p>
<p>And finally, I refer you back to <a href="http://wading-in.net/walkabout/2010/04/happy-birthday-hubble/" target="_blank">this post from two years ago</a>, which contains the video made from the Ultra Deep Field photos, simply because it&#8217;s one of the coolest animations ever made. Yeah, you might have seen it already &#8211; so? Watch it again. It&#8217;s a great dose of perspective, in both directions. While it is easy to feel insignificant in comparison to the unfathomable distances involved, there&#8217;s the other side of the coin<strong>:</strong> <em>we figured out how to actually see this</em>. Damn clever little apes, aren&#8217;t we?</p>
<p>But then, I guess we <em>would</em> think that&#8230;</p>
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		<title>Too cool, part 13: I&#8217;m a spider, raargh!</title>
		<link>http://wading-in.net/walkabout/2012/02/too-cool-part-13-im-a-spider-raargh/</link>
		<comments>http://wading-in.net/walkabout/2012/02/too-cool-part-13-im-a-spider-raargh/#comments</comments>
		<pubDate>Sun, 26 Feb 2012 18:56:23 +0000</pubDate>
		<dc:creator>Al Denelsbeck</dc:creator>
				<category><![CDATA[Continued from other blogs]]></category>
		<category><![CDATA[Nature]]></category>
		<category><![CDATA[Science & Evolution]]></category>
		<category><![CDATA[Too Cool]]></category>
		<category><![CDATA[arachnophobia]]></category>
		<category><![CDATA[camouflage]]></category>
		<category><![CDATA[fruit fly]]></category>
		<category><![CDATA[jumping spider]]></category>
		<category><![CDATA[Rhagoletis]]></category>

		<guid isPermaLink="false">http://wading-in.net/walkabout/?p=7261</guid>
		<description><![CDATA[<p>Since I have yet to obtain any images illustrating this (and because there may not even be examples of such within this country, I may not ever, sniff,) I refer you to Alex Wild of Myrmecos fame, guest-blogging on Scientific American&#8217;s site, for his post on &#8220;The fly that banks on arachnophobia.&#8221;</p> <p>If you [...]]]></description>
			<content:encoded><![CDATA[<p>Since I have yet to obtain any images illustrating this (and because there may not even be examples of such within this country, I may not ever, <em>sniff</em>,) I refer you to Alex Wild of <a href="http://myrmecos.net/" target="_blank"><em>Myrmecos</em></a> fame, guest-blogging on <a href="http://www.scientificamerican.com/" target="_blank"><em>Scientific American&#8217;s</em></a> site, for his post on &#8220;<a href="http://networkedblogs.com/ulx6E" target="_blank"><strong>The fly that banks on arachnophobia.</strong></a>&#8221;</p>
<p>If you wish, pause for a second and try to imagine how a fly might benefit from something being scared of spiders, like I did. Chances are, it&#8217;s better than you imagined. Most especially, when you see a <a href="https://www.facebook.com/photo.php?fbid=10150225369999372&amp;l=d164cc847e" target="_blank"><strong>different (and more appropriate) angle provided by Warren Laurde</strong> </a>in the comments.</p>
<p>It all leads me to wonder, how long before spiders develop secret signs amongst themselves, like visual passwords, to flush out the imposters?</p>
<p style="text-align: center;">*      *      *      *</p>
<p><font size="-1">My competitive side tells me not to link to <em>Myrmecos</em>, since Alex Wild is a much better photographer than I, but the unwritten rules of the net dictate that he reciprocate, right? And if that works, I&#8217;ll be praising Canon for their MP-E 65mm soon&#8230;</font></p>
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		<title>Too cool, part twelve: Won&#8217;t fit in the bag</title>
		<link>http://wading-in.net/walkabout/2011/12/too-cool-part-twelve-wont-fit-in-the-bag/</link>
		<comments>http://wading-in.net/walkabout/2011/12/too-cool-part-twelve-wont-fit-in-the-bag/#comments</comments>
		<pubDate>Thu, 22 Dec 2011 04:49:49 +0000</pubDate>
		<dc:creator>Al Denelsbeck</dc:creator>
				<category><![CDATA[Astronomy]]></category>
		<category><![CDATA[Photography]]></category>
		<category><![CDATA[Science & Evolution]]></category>
		<category><![CDATA[Too Cool]]></category>
		<category><![CDATA[general relativity]]></category>
		<category><![CDATA[gravitational lensing]]></category>
		<category><![CDATA[Hubble Space Telescope]]></category>
		<category><![CDATA[LRG 3-757]]></category>

		<guid isPermaLink="false">http://wading-in.net/walkabout/?p=6834</guid>
		<description><![CDATA[<p>Courtesy of NASA&#8217;s Astronomy Photo of the Day, I present one of the most interesting examples of unintuitive physics: the curvature of spacetime to produce a gravitational lens. The ring that you see here is not the shock wave from a supernova affecting the surrounding gases, as I first thought, but actually a blue [...]]]></description>
			<content:encoded><![CDATA[<p><a href="http://apod.nasa.gov/apod/ap111221.html" target="blank"><img src="http://wading-in.net/walkabout/wp-content/uploads/2011/12/lensshoe_hubble_crop.jpg" alt="LRG 3-757" title="lensshoe_hubble_crop" width="730" height="375" class="alignleft size-full wp-image-6835" /></a><br clear="all"/>Courtesy of NASA&#8217;s <a href="http://apod.nasa.gov/apod/ap111221.html" target="_blank">Astronomy Photo of the Day</a>, I present one of the most interesting examples of unintuitive physics<strong>:</strong> the curvature of spacetime to produce a gravitational lens. The ring that you see here is not the shock wave from a supernova affecting the surrounding gases, as I first thought, but actually a blue galaxy far beyond the yellow one in the center, whose image has been distorted into a surrounding ring because of the dense gravity of the central galaxy.</p>
<p><img src="http://wading-in.net/walkabout/wp-content/uploads/2011/12/lens.jpg" alt="" title="lens" width="437" height="270" class="alignright size-full wp-image-6836" />Here&#8217;s how it works. A normal lens, as almost anyone can tell you, &#8220;bends light,&#8221; but what this actually means is not as well understood, and often poorly illustrated. Let&#8217;s say you have a star, which only looks like a point of light from our distance (I added the twinkle for artistic statement.) It&#8217;s emitting light in all directions, so we can take a few paces to the left and still see it, or across the continent, or (should we be able to travel that far) all the way on the other side of it. The light from it is actually a spreading globe of photons, and we see just the one stream that meets our eyes (yes, that&#8217;s an eye in the upper part of the illustration.) A lens, however, catches all of the streams that meet its surface, essentially a cone, and bends the light to make all of these streams converge back down into the &#8216;dot&#8217; of the star &#8211; provided that you&#8217;re the right distance for that particular lens, called the <em>focal length</em>.</p>
<p><img src="http://wading-in.net/walkabout/wp-content/uploads/2011/12/gravitylens.jpg" alt="" title="gravitylens" width="437" height="145" class="alignright size-full wp-image-6839" />Gravity can be strong enough to bend light. This is not entirely true, since what it does is curve spacetime, which is what the light travels through &#8211; you can draw a straight line on a piece of paper and then curl the paper, curving the line. Close enough. With very large galaxies, or more often a whole cluster of tightly-packed galaxies, the gravity can be dense enough that the light from a distant star or another galaxy, out of our sight behind the first, is bent away from its original path that would normally have not even come near us, going instead to Proxima Centauri or someplace. If the alignment is just right, we can see multiple distant objects in several mirror positions around the lensing galaxy, as the light path is bent according to the strength of the gravity at certain points around the lensing galaxy. Placed <em>exactly</em> right, and with fairly high uniformity in gravity around the galaxy, and the distant hidden subject gets distorted into a surrounding ring, which is what we see here with yellow galaxy LRG 3-757. It obscures our direct line of sight to the distant blue galaxy, but we get a nearly spherical path from around the edges, as it were.</p>
<p>What&#8217;s interesting about gravitational lensing is, if we were along the line of one of those original paths from the distant star or galaxy, continuing an imaginary path unbent past the gravitational lens (see point A in the illustration,) we would have a perfectly clear line of sight to the distant subject and <em>never see it</em>, since the light was redirected. And in fact, we can only speculate how often this actually happens, since we have no way of knowing. Gravity distorts the path of <em>all</em> light, but usually in such small increments that it doesn&#8217;t matter much.</p>
<p>When Einstein proposed General Relativity, which indicated that gravity wasn&#8217;t an attractive property but rather an effect of spacetime itself, we didn&#8217;t have the ability to test it out in any way, but plenty of astrophysicists hashed out the details looking for errors or implications. One Fritz Zwicky extrapolated it to mean that areas of very high gravity, such as close-packed galaxy clusters, could bend the light paths from more distant objects. It&#8217;s simply fascinating to see theories of such a bizarre nature be proven with remarkable images such as this. Another curious implication of General Relativity is the collapsed neutron star usually called a <em>black hole</em>, which would also lens light that passed a certain distance away, but completely capture light that passed too close. We should be able to see lensing from such as well, except that, to our knowledge, black holes have only occurred in the centers of galaxies, and might even be necessary for galaxy formation. Thus it is entirely possible that the lensing galaxy you see in this image is home to a black hole deep in the center, but we do not see a &#8216;hole&#8217; because it is surrounded by stars well outside of its event horizon, the imaginary sphere around it where light cannot escape. There is even a very very faint chance that some of the light in that central smudge is from stars on the <em>opposite</em> side of a central black hole, bent towards us by the gravity.</p>
<p>As lenses go, by the way, LRG 3-757 is a whopper. About 4.6 billion light years away at the time the light left, it&#8217;s one hell of a focal length. It&#8217;s also a tad heavy to carry around, as you might imagine, so not really useful to look at anything else. And as seen, its field curvature is kind of egregious.</p>
<p>Here&#8217;s another cool thing. The universe is expanding, and the light reaching us now is from objects that have long since left those positions. The distances between LRG 3-757 and the warped galaxy forming the ring are changing, and this curious optical affect will vanish after a while &#8211; probably well outside of our lifetimes. At the same time, others that we cannot see now may appear later on as the cosmic focal length changes.</p>
<p>Be sure to check the <a href="http://apod.nasa.gov/apod/ap111221.html" target="_blank">original APOD page</a> and click on the image to see the high resolution version, which shows much more surrounding detail and is a nice starfield image on its own. And reduces the resemblance to HAL 9000. Once again, we have these images thanks to the <a href="http://hubble.nasa.gov/" target="_blank">Hubble Space Telescope</a>, which is Photographer of the Decade (twice in a row) as far as I&#8217;m concerned. I&#8217;m gonna be frustrated when it&#8217;s decommissioned&#8230;</p>
<p style="text-align: center;"> * </p>
<p><font size ="-1">My thanks to <a href="http://www.cloudbait.com/" target="_blank">Chris L. Peterson at Cloudbait Observatory</a> for supplying a pertinent detail regarding LRG 3-757 on the <a href="http://asterisk.apod.com/index.php" target="_blank">Starship Asterisk forums</a>, a great place to ask questions.</font></p>
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		<title>Too cool, part eleven: Sylvan Heights Bird Park</title>
		<link>http://wading-in.net/walkabout/2011/10/too-cool-part-eleven-sylvan-heights-bird-park/</link>
		<comments>http://wading-in.net/walkabout/2011/10/too-cool-part-eleven-sylvan-heights-bird-park/#comments</comments>
		<pubDate>Fri, 28 Oct 2011 01:47:43 +0000</pubDate>
		<dc:creator>Al Denelsbeck</dc:creator>
				<category><![CDATA[Nature]]></category>
		<category><![CDATA[Photography]]></category>
		<category><![CDATA[Science & Evolution]]></category>
		<category><![CDATA[Too Cool]]></category>
		<category><![CDATA[Abyssinian Ground Hornbill]]></category>
		<category><![CDATA[Argus Pheasant]]></category>
		<category><![CDATA[Argusianus argus]]></category>
		<category><![CDATA[Bucorvus abyssinicus]]></category>
		<category><![CDATA[Danphe]]></category>
		<category><![CDATA[Dark-winged Trumpeter]]></category>
		<category><![CDATA[endangered species]]></category>
		<category><![CDATA[Goura victoria]]></category>
		<category><![CDATA[Grus antigone]]></category>
		<category><![CDATA[Himalayan Monal Pheasant]]></category>
		<category><![CDATA[Impeyan Monal]]></category>
		<category><![CDATA[Lophophorus impejanus]]></category>
		<category><![CDATA[Mike Lubbock]]></category>
		<category><![CDATA[Psophia viridis]]></category>
		<category><![CDATA[Sarus Crane]]></category>
		<category><![CDATA[Scotland Neck]]></category>
		<category><![CDATA[Sylvan Heights Bird Park]]></category>
		<category><![CDATA[Victoria Crowned Pigeons]]></category>

		<guid isPermaLink="false">http://wading-in.net/walkabout/?p=6135</guid>
		<description><![CDATA[<p>As I indicated in the previous post, we had a trip planned that might produce some new images, and while I&#8217;d like to build the suspense to the point of frustration, I find this a hard thing to do, especially when I lead the post off with a header photo. So yes, we did [...]]]></description>
			<content:encoded><![CDATA[<p><img src="http://wading-in.net/walkabout/wp-content/uploads/2011/10/GroundHornbill.jpg" alt="" title="GroundHornbill" width="730" height="487" class="alignleft size-full wp-image-6136" /><br clear="all" />As I indicated in the previous post, we had a trip planned that might produce some new images, and while I&#8217;d like to build the suspense to the point of frustration, I find this a hard thing to do, especially when I lead the post off with a header photo. So yes, we did get some useful stuff, and this will be another multiple post.</p>
<p>Nature photographers, as well as amateur naturalists and simply people interested in animals, need to get out from time to time to places where close encounters are virtually guaranteed &#8211; in the case of nature photographers, it&#8217;s to build stock images and add some portrait and interest-style pics, but it also helps to learn a bit more about whatever species you can. <a href="http://shwpark.com/" target="_blank"><strong>Sylvan Heights Bird Park</strong></a> has been on my list for a few years now, but it sits in a remote town in NC called Scotland Neck, which really isn&#8217;t close to anything except I-95. However, it&#8217;s well worth the special trip, and more than once, too. It&#8217;s not just the variety or good opportunities for avian photos, but the fact that it is almost interactive.</p>
<p><img src="http://wading-in.net/walkabout/wp-content/uploads/2011/10/SarusCrane.jpg" alt="" title="SarusCrane" width="400" height="515" class="alignleft size-full wp-image-6139" />The first indication of what kind of a day it would be came early on, having entered the park and started out on the deck observing the first pond. While comparing the number of birds, mostly ducks, that were coming up for morning chow, The Girlfriend began making excited attention-getting sounds while being unable to create any actual words. I was trying to remember the procedure for the Heimlich maneuver when I saw what had her attention, which was a young crane eagerly following a park worker up the path like a puppy. The worker heard us, and on return helpfully came over to allow us a closer look. Her companion was a nine-week-old Sarus Crane (<em>Grus antigone</em>), about 80 cm (2 ft) tall and still in the needy stage. That alone probably would have sealed the deal, at least as far as The Girlfriend was concerned, but it was only the start.</p>
<p>The park has several aviary sections with gates that the public is invited to enter, which puts them among a wide selection of fowl each time. Typically, low fences separate the public from the natural areas for the birds, but this doesn&#8217;t mean that some of the birds won&#8217;t come by out of curiosity or the thought of a handout (food is available to be given out to the birds if desired.) From a nature photographer&#8217;s viewpoint, this has both bad and good points. The fencing and netting is a necessary part of having a public attraction such as this, but it does produce a number of limitations if you&#8217;re trying to leave such things out of your images (and you should.) However, most of the areas are fairly large and provide angles to eliminate the man-made aspects, so while it isn&#8217;t possible to photograph every species this way, most can be exploited with a little effort.</p>
<p>For the Abyssinian Ground Hornbill (<em>Bucorvus abyssinicus</em>) at top, I was able to shoot through the fencing by putting the lens against the openings, producing only the subtle staggered background seen behind her head. The fence was necessary, however, as she tried to greet my close approaches with that massive beak, and while she might simply have wanted a handout, finding out the hard way that she was being protective of her territory is something I&#8217;d prefer to avoid.</p>
<p><img src="http://wading-in.net/walkabout/wp-content/uploads/2011/10/VictoriaCrownedPigeon.jpg" alt="" title="VictoriaCrownedPigeon" width="300" height="450" class="alignright size-full wp-image-6142" />The other side of this coin was the pair of Victoria Crowned Pigeons (<em>Goura victoria</em>) who came up to the fence at our feet and hung out for portraits, then hopped onto the railing to really mug it up, even nibbling on The Girlfriend&#8217;s lenshood in the vague hope that Canon had finally made one that was edible (we&#8217;ve all been waiting.) There&#8217;s always a part of me that&#8217;s prepared for the defensive peck or bite, since what appears friendly to us is often intended as a menacing warning sign from birds, but the Vics were totally blasé about our presence. Another Crowned Pigeon, this one alone in a cage nearby, began producing a remarkable call, so bass that it was hard to trace and almost disturbing &#8211; I can recommend bringing either a sound recording device or video camera to capture the full range of experience within the park. Also, when shooting digital, be sure to snap the identification signs as you go so you have a record of the species later on.</p>
<p>The various bird calls, of course, form a jungle-movie soundtrack of background noise throughout the park, occasionally interspersed with someone&#8217;s piercing cries just, apparently, for the hell of it. The Argus Pheasant (<em>Argusianus argus</em>) could produce a &#8220;Wooo!&#8221; that would have made Michael Jackson give up in frustration, and started a string of calls that got gradually faster until it sounded like a siren. A Dark-winged Trumpeter (<em>Psophia viridis</em>) favored us with a rattling sound much like the local crows, which I imitated by dragging my finger against the cage fencing, thereby eliciting a brief conversation. I have no idea what either of us said, but I suspect the bird was simply correcting my pronunciation.</p>
<p>The park itself is the offshoot of a decades long breeding program by the founder, Mike Lubbock, who started it as a private preserve in 1989, only opening the public center in 2006. Thus, much of it is dedicated to threatened and endangered species around the globe, and a whole portion of the facility is separate from the public park, which is where breeding programs for zoos and conservation efforts take place. There were several species that we saw that we already knew from the NC Zoological Park and the three NC aquariums, and we suspect we now know where they came from.</p>
<p><img src="http://wading-in.net/walkabout/wp-content/uploads/2011/10/HimalayanMonal.jpg" alt="" title="HimalayanMonal" width="500" height="358" class="alignright size-full wp-image-6152" />It also provides the opportunity to see some rare and endangered species up close and personal, as well as some really vivid ones, like this startlingly iridescent Himalayan Monal Pheasant (<em>Lophophorus impejanus</em>,) also known as an Impeyan Monal or Danphe. The difference between the male and female (the male shown here) is so drastic as to convince virtually anyone that they are completely separate species. And the nice thing about two people shooting is that one of you can save the ass of the other when they fail to get a decent image, as happened here.</p>
<p>I&#8217;ve never been too excited about ducks, which admittedly is where the strength of this park lies &#8211; there are more species here than I&#8217;ve seen in any other facility or collection, from every continent. Regardless, if you&#8217;re <a href="http://wading-in.net/walkabout/2011/09/amateur-naturalism-part-two/" target="_blank">into birds</a> in the least, this is a great place to visit, showing off species, plumage, and behavior in prime viewing conditions. Photographers won&#8217;t need a long telephoto lens to get decent photos &#8211; most of my shots were done with my 24-135mm workhorse &#8211; but a tele can produce great portraits from even the shy residents. The park is also kid-friendly, handicapped accessible, and picnic lunches are welcome. Check it out!</p>
<p><em>Coming up</em><strong>:</strong> more photos and encounters from the park&#8230; which can now be found <a href="http://wading-in.net/walkabout/2011/10/sylvan-heights-continued/" target="_blank">here</a>. </p>
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		<title>Shhhh! TV&#8230;</title>
		<link>http://wading-in.net/walkabout/2011/10/shhhh-tv/</link>
		<comments>http://wading-in.net/walkabout/2011/10/shhhh-tv/#comments</comments>
		<pubDate>Wed, 05 Oct 2011 20:40:02 +0000</pubDate>
		<dc:creator>Al Denelsbeck</dc:creator>
				<category><![CDATA[Critical Thinking]]></category>
		<category><![CDATA[Too Cool]]></category>

		<guid isPermaLink="false">http://wading-in.net/walkabout/?p=5935</guid>
		<description><![CDATA[<p>I know it&#8217;s short notice, but I just found out about it myself, courtesy of The Manatee. If you get Discovery Channel, there is a new show premiering tonight right after Mythbusters, going by the pseudonym of Penn &#038; Teller Tell A Lie, and it sounds like it should be pretty cool. I&#8217;ll be [...]]]></description>
			<content:encoded><![CDATA[<p>I know it&#8217;s short notice, but I just found out about it myself, courtesy of The Manatee. If you get Discovery Channel, there is a new show premiering tonight right after <em>Mythbusters</em>, going by the pseudonym of <a href="http://dsc.discovery.com/tv/penn-and-teller-tell-a-lie/" target="_blank"><strong><em>Penn &#038; Teller Tell A Lie</em></strong></a>, and it <a href="http://www.wired.com/geekdad/2011/10/penn-teller-tell-a-lie-is-mythbusters-turned-sideways-and-it-works/" target="_blank">sounds like</a> it should be pretty cool. I&#8217;ll be recording it, so if you miss it, come on by and bring popcorn.</p>
<p>But not beer&#8230;</p>
<p><font size="-1">See? I knew guilt trips would work&#8230;</font></p>
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		<title>Just for fun</title>
		<link>http://wading-in.net/walkabout/2011/08/just-for-fun/</link>
		<comments>http://wading-in.net/walkabout/2011/08/just-for-fun/#comments</comments>
		<pubDate>Sun, 28 Aug 2011 15:22:53 +0000</pubDate>
		<dc:creator>Al Denelsbeck</dc:creator>
				<category><![CDATA[Humor]]></category>
		<category><![CDATA[Random]]></category>
		<category><![CDATA[Too Cool]]></category>
		<category><![CDATA[nobody chundered]]></category>
		<category><![CDATA[nobody gets eaten either]]></category>
		<category><![CDATA[Walking With Dinosaurs]]></category>

		<guid isPermaLink="false">http://wading-in.net/walkabout/?p=5511</guid>
		<description><![CDATA[<p>I actually get chills when watching the following video &#8211; it&#8217;s just too cool seeing this all come together:</p> <p></p> <p>I&#8217;ve known this video for a couple of years now, and there&#8217;s a decent chance you&#8217;re familiar with it; at least with the tour that culminated from it. That, however, was only the lead-in [...]]]></description>
			<content:encoded><![CDATA[<p>I actually get chills when watching the <a href="http://youtu.be/rhUJmKIPKGY" target="_blank">following video</a> &#8211; it&#8217;s just too cool seeing this all come together<strong>:</strong></p>
<p><iframe width="480" height="390" src="http://www.youtube.com/embed/rhUJmKIPKGY" frameborder="0" allowfullscreen></iframe></p>
<p>I&#8217;ve known this video for a couple of years now, and there&#8217;s a decent chance you&#8217;re familiar with it<strong>;</strong> at least with the tour that culminated from it. <em>That</em>, however, was only the lead-in for <a href="http://youtu.be/oTWMXRWN0N8" target="_blank"><em>this</em></a>. Turn your volume down if you&#8217;re someplace public<strong>:</strong></p>
<p><iframe width="640" height="390" src="http://www.youtube.com/embed/oTWMXRWN0N8" frameborder="0" allowfullscreen></iframe></p>
<p>Seriously, hang onto that link &#8211; there&#8217;s nothing better to cheer you up when you&#8217;re down than baby animals. Yes, I&#8217;m referring to the kids with that ;-)</p>
<p>This was a promo to announce the <a href="http://www.dinosaurlive.com/" target="_blank"><em>Walking With Dinosaurs</em></a> tour in Australia (unfortunately, shameful autoplay video at that link &#8211; never, ever do this.) When the tour came into this area of the US, there was no way in hell we were going to afford it at that time, which is a shame, because the effort put into it is astounding. It&#8217;s impossible to say whether the behaviors and movements displayed are accurate depictions of species from millions of years ago, but from our perspective with the species alive now, they certainly <em>look</em> realistic. In an age when no movie company seems capable of producing entertainment without hosing around the CGI, clumsily and shamelessly, seeing what can be done with live action is refreshing.</p>
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		<title>Too cool, part ten: Bang!</title>
		<link>http://wading-in.net/walkabout/2011/08/too-cool-part-ten-bang/</link>
		<comments>http://wading-in.net/walkabout/2011/08/too-cool-part-ten-bang/#comments</comments>
		<pubDate>Wed, 17 Aug 2011 15:51:43 +0000</pubDate>
		<dc:creator>Al Denelsbeck</dc:creator>
				<category><![CDATA[Nature]]></category>
		<category><![CDATA[Photography]]></category>
		<category><![CDATA[Science & Evolution]]></category>
		<category><![CDATA[Too Cool]]></category>
		<category><![CDATA[Alpheus heterochaelis]]></category>
		<category><![CDATA[Bigclaw Snapping Shrimp]]></category>
		<category><![CDATA[Clibanarius vittatus]]></category>
		<category><![CDATA[grass shrimp]]></category>
		<category><![CDATA[Palaemonetes pugio]]></category>
		<category><![CDATA[Pistol shrimp]]></category>
		<category><![CDATA[snapping shrimp]]></category>
		<category><![CDATA[sonoluminescence]]></category>
		<category><![CDATA[Thinstripe Hermit Crab]]></category>

		<guid isPermaLink="false">http://wading-in.net/walkabout/?p=5376</guid>
		<description><![CDATA[<p>I&#8217;ve related this in part elsewhere on the site, but I thought it deserved its own post, especially since it was one of the more memorable experiences from a few years ago.</p> <p>When I lived in Florida, I started &#8220;maintaining&#8221; a small saltwater aquarium to house photo subjects and interesting marine critters. Being close [...]]]></description>
			<content:encoded><![CDATA[<p><img src="http://wading-in.net/walkabout/wp-content/uploads/2011/08/pistol1.jpg" alt="" title="pistol1" width="730" height="442" class="alignleft size-full wp-image-5382" /><br clear="all"/>I&#8217;ve related this in part elsewhere on the site, but I thought it deserved its own post, especially since it was one of the more memorable experiences from a few years ago.</p>
<p>When I lived in Florida, I started &#8220;maintaining&#8221; a small saltwater aquarium to house photo subjects and interesting marine critters. Being close to both the ocean and the Indian River Lagoon, a large isolated saltwater sound inside the barrier islands facing the Atlantic, I had lots of access to the aquatic residents. I could bicycle down to the lagoon to snorkel, and did this frequently. Mostly, what I saw were crabs, barnacles, and oysters, but I had encounters with dolphins, manatees, stingrays, and jellyfish too.</p>
<p>Now, I put &#8220;maintaining&#8221; this aquarium in quotes above because I did not manage this as most people manage saltwater aquariums with their exotic tropical fish. There was no careful measuring of pH levels, no purchases of salt and mineral mix, no consideration of compatible species, and no filtering. Instead, I obtained water directly from the lagoon a few times a week, simply aerated or circulated, and whatever I caught that I had an interest in had to fend for itself. I had a basic heater to maintain the water at roughly the same temperature as the sound, and not much else. I couldn&#8217;t filter, since many species that I caught were filter feeders themselves and relied on microorganisms in the water.</p>
<p>I had no underwater photography gear, so the tank allowed me to photograph various small catches under controlled conditions, where lighting and setting, as well as water clarity, were not up for grabs. While most critters stayed only a few days at best, several of my subjects became long-term residents, as keeping them required little more than fresh water and seaweeds, and they thrived surprisingly well. I&#8217;m pretty ambiguous about fish, but I like crustaceans, so I had several porcelain crabs, a handful of fascinating little grass shrimp, numerous small anemones, and a tiny flounder that I caught by chance, slightly larger than a quarter.</p>
<p>One catch stymied me, though. Basically, it was a 8 cm (3 in) &#8220;lobster&#8221; in deep green fading to blue-white on the underside, with one pincer being huge and misshapen, tumorous-looking. It bore some resemblance to a crayfish, but slimmer, and I was pretty sure there were no saltwater crayfish. Web searches turned up nothing &#8211; what do you search on, especially when, like me, you have no knowledge of marine biology? It was very shy and remained hidden, so I kept it for a few weeks as I worked out ways to photograph it in a decent setting.</p>
<p>Some nights, down at a dock collecting water and whatever nocturnal denizens I could spot, I heard a very sharp <em>clack!</em> nearby, like a small stone hitting a rock at high velocity. Absolutely no one was around, and the area I would hear it from, less than a few meters away, was often devoid of rocks above the surface. I found it hard to believe that anything beneath the surface would produce a sound in this pitch (usually water reduces the pitch,) so this remained a mystery. I was keeping a loose journal of observations at the time, and in that I speculated on things like archer fish, the species that hunts insects above the surface by spitting water droplets at them, but even then, this seemed implausible.</p>
<p>Sometimes, while snorkeling, I&#8217;d hear it too, and one day I got a series of them while trying to extricate a small crab from a crevice in a piling. Aha! But the pitch seemed a little off, and certainly not as loud. </p>
<p>Then, one night when I was almost asleep, the tank produced a sound like a marble hitting the side, and I immediately got up to see if one of the glass sides had fractured. But no cracks, leaks, or chips were visible in the slightest, and nothing that could fall over to strike the side. I had several crab species in the tank at this time, but able to produce so sharp a noise? Naaahhh&#8230;</p>
<p>You have, of course, already made the connection since I didn&#8217;t structure this tale as a murder mystery, but this was an ongoing curiosity to me for a while &#8211; until I stumbled across an illustration for a pistol shrimp, sometimes called snapping shrimp, while doing some online research. And suddenly realized just how cool one of my residents really was.<br />
<img src="http://wading-in.net/walkabout/wp-content/uploads/2011/08/pistol2.jpg" alt="" title="pistol2" width="730" height="376" class="alignleft size-full wp-image-5381" /><br clear="all"/><a href="http://www.sms.si.edu/irlfieldguide/alpheu_hetero.htm" target="_blank">Pistol shrimp</a> (<em>Alpheus heterochaelis</em>) have a unique way of obtaining food. That <a href="http://wading-in.net/Tank/Pistolshrimp.html" target="_blank">misshapen claw</a> (chelae) houses a simple mechanism that allows the thumb (dactylus) to open and lock in place, cocked like a gun, to be released under great muscular force when a food source is nearby. The shape of the claw and the velocity of it slamming closed produces a shock wave that stuns nearby prey, whereupon the shrimp can amble over and eat it leisurely &#8211; and of course, the shock wave was what I was hearing. The sound has to be heard to be believed, since it&#8217;s surprisingly loud. Bear in mind that this method of hunting is not a contact system but works at short distances, most especially on prey that can be affected by pressure. I cannot attempt to explain this as &#8220;non-aggressive,&#8221; since this is predation and not scavenging or foraging, but the shy pistol shrimp doesn&#8217;t have to throw down with its prey in full-contact sport, but opens its can of WhupAss (well-shaken it would seem) from a safe distance, bringing a gun to what is almost always a knife fight throughout the environment.</p>
<p>Even more interesting, the force actually causes a <a href="http://www.youtube.com/watch?v=ONQlTMUYCW4" target="_blank">cavitation bubble</a> to appear (cool video,) momentarily creating a region of vacuum in the water within the immediate vicinity of The Claw, and this can at times even produce a tiny flash of light called <a href="http://en.wikipedia.org/wiki/Sonoluminescence#Biological_sonoluminescence" target="_blank">sonoluminescence</a> This is not visible to the naked eye so I never witnessed this myself, and in fact only got to see the behavior in action once. This occurred when I introduced a fist-sized <a href="http://wading-in.net/Tank/Hermitride.html" target="_blank">thinstripe hermit crab</a> (<em>Clibanarius vittatus</em>) into the tank for the afternoon, to obtain some images. While the crab sat, minding its own business atop a rock, the pistol shrimp obviously had some difficulties with its presence. I watched as, several times, the shrimp eased out from under a rock, slipped up to the hermit crab from behind, and placed The Claw right against one of the crab&#8217;s legs, firing off a shot at point-blank range before darting back under cover. The crab, perhaps with smug condescension, showed absolutely no reaction at all to this treatment. No, I didn&#8217;t get any pics of this happening, since my observation angle was poor and setting up the camera and lights likely would have halted the action.</p>
<p>A perfectly legitimate question is to ask how something like this could have evolved (yet it is <em>illegitimate</em>, when unable to fathom this, to assume it could <em>not</em> have.) But grasping appendages and claws to break apart food are common, so the significant difference here is the speed and shape of such producing a shock wave. Yet almost all chelae would, to some extent, and sounds can be used for communication and threat displays as well, so have multiple reasons to be refined by evolution. Anything that produces a sound (which is really just pressure waves in the medium, in this case water) that can affect something else at short distances can obtain prey without contact, and even a tiny distance is an advantage. It is also fairly likely that, long ago, the prey species were easier to stun too, and both the defensive pressure resistance of the prey, and the sonic ability of the pistol shrimp, increased in competition with each other over thousands of generations of each. I&#8217;m just sorry I can&#8217;t be around in a few thousand more generations to watch blaster shrimp nailing their food with sonoluminescent laser bolts&#8230;</p>
<p>If you were sharp-eyed above (or have seen the image in the <a href="http://wading-in.net/page2-MainGallery.html" target="_blank">photo gallery</a> of the site,) you noticed the eggs carried in the pleopods (swimming appendages under the tail) of the pistol shrimp in my tank. Nothing ever came of this, possibly because there was no male handy to fertilize them. Below, a family portrait from the aquarium, showing a transparent <a href="http://wading-in.net/Tank/Shrimp1.html" target="_blank">grass shrimp</a> (atop the rock and facing the camera), two tiny hermit crabs, and even the flounder, mostly buried in the crushed shell at bottom &#8211; directly under the larger hermit crab can be seen one of the googly eyes, and the darker region to the right of that is the top surface of the fish.<br />
<img src="http://wading-in.net/walkabout/wp-content/uploads/2011/08/FamilyPortrait2.jpg" alt="" title="FamilyPortrait2" width="730" height="618" class="alignleft size-full wp-image-5394" /></p>
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