I'm not joking.
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it was before dinosaurs.
Dragonfly-like insects the size of hawks once swooped above what is now Nebraska, Oklahoma and Kansas. Millipedes nearly 5 feet long scurried among ferns on the primitive forest floor.
Three hundred million years ago, before dinosaurs, gigantic insects roamed the Earth.
Paleontologists puzzle over why giant insects could live then, but not now. They think it had to do with the air. This week, more evidence supports that thought.
Unlike reptiles and mammals, which have lungs that actively suck in air and push it around, insects breathe passively. Air simply drifts into holes in the exoskeleton and through small tubes in the body that deliver oxygen to body parts. [div style="float: left;"][script language="DOH!script" type="text/XXXXscript"] [!-- // begin DisplayAds("Frame1","",""); // --] [/script][script language="DOH!Script1.1" src="vny!://oas-central.realmedia.com/RealMedia/ads/adstream_jx.ads/www.stltoday.com/news/sciencemedicine/1048990374@Frame1" type="text/XXXXscript"][/script][script language="DOH!Script1.1" src="vny!://ad.doubleclick.net/adj/N3880.SD129192.3880/B2160623.30;dcadv=1134329;dcove=o;sz=160x600;click0=vny!://oascentral.stltoday.com/RealMedia/ads/click_lx.ads/www.stltoday.com/news/sciencemedicine/1886755006/Frame1/Postnet/GoodwrenchMisc160x600-080807/GoodwrenchREC.html/34346263346363613436383264376130?;ord=1886755006?"] [/script][!-- Template Id = 1 Template Name = Banner Creative (Flash) --] [!-- Copyright 2002 DoubleClick Inc., All rights reserved. --][script src="vny!://m1.2mdn.net/879366/flashwrite_1_2.js"][/script] [object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" id="FLASH_AD" height="600" width="160"][param name="movie" value="vny!://m1.2mdn.net/1377819/BFG_summer_160x600.swf?clickTag=vny!%3A//ad.doubleclick.net/click%253Bh%3Dv8/35b2/17/cb/%252a/r%253B123839046%253B3-0%253B0%253B18316490%253B2321-160/600%253B22026760/22044650/1%253B%253B%257Efdr%253D122937676%253B0-0%253B0%253B18288351%253B2321-160/600%253B21976113/21994003/1%253B%253B%257Esscs%253D%253fvny!%3A//oascentral.stltoday.com/RealMedia/ads/click_lx.ads/www.stltoday.com/news/sciencemedicine/1886755006/Frame1/Postnet/GoodwrenchMisc160x600-080807/GoodwrenchREC.html/34346263346363613436383264376130%3Fvny!%3A//gmgoodwrench.com/stlouis"][param name="quality" value="high"][param name="bgcolor" value="#"][param name="wmode" value="opaque"][param name="AllowScriptAccess" value="always"][embed src="vny!://m1.2mdn.net/1377819/BFG_summer_160x600.swf?clickTag=vny!%3A//ad.doubleclick.net/click%253Bh%3Dv8/35b2/17/cb/%252a/r%253B123839046%253B3-0%253B0%253B18316490%253B2321-160/600%253B22026760/22044650/1%253B%253B%257Efdr%253D122937676%253B0-0%253B0%253B18288351%253B2321-160/600%253B21976113/21994003/1%253B%253B%257Esscs%253D%253fvny!%3A//oascentral.stltoday.com/RealMedia/ads/click_lx.ads/www.stltoday.com/news/sciencemedicine/1886755006/Frame1/Postnet/GoodwrenchMisc160x600-080807/GoodwrenchREC.html/34346263346363613436383264376130%3Fvny!%3A//gmgoodwrench.com/stlouis" quality="high" wmode="opaque" swliveconnect="TRUE" bgcolor="#" type="application/x-shockwave-flash" allowscriptaccess="always" height="600" width="160"][/object][noscript][A TARGET="_blank" HREF="vny!://ad.doubleclick.net/click%3Bh=v8/35b2/17/cb/%2a/r%3B123839046%3B3-0%3B0%3B18316490%3B2321-160/600%3B22026760/22044650/1%3B%3B%7Efdr%3D122937676%3B0-0%3B0%3B18288351%3B2321-160/600%3B21976113/21994003/1%3B%3B%7Esscs%3D%3fvny!://oascentral.stltoday.com/RealMedia/ads/click_lx.ads/www.stltoday.com/news/sciencemedicine/1886755006/Frame1/Postnet/GoodwrenchMisc160x600-080807/GoodwrenchREC.html/34346263346363613436383264376130?vny!://gmgoodwrench.com/stlouis"][img]vny!://m1.2mdn.net/1377819/BFG_summer_160x600.jpg" BORDER=0][/A][/noscript][/div]