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	<title>The Why Files &#187; Earth&#8217;s history</title>
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		<title>Diamonds, Chocolate, Mating</title>
		<link>http://whyfiles.org/2002/diamonds-chocolate-mating/</link>
		<comments>http://whyfiles.org/2002/diamonds-chocolate-mating/#comments</comments>
		<pubDate>Thu, 07 Feb 2002 17:46:47 +0000</pubDate>
		<dc:creator>schulte</dc:creator>
				<category><![CDATA[All]]></category>
		<category><![CDATA[Behavior of organisms]]></category>
		<category><![CDATA[Bio brainstorms]]></category>
		<category><![CDATA[Biology]]></category>
		<category><![CDATA[By Subject]]></category>
		<category><![CDATA[By Theme]]></category>
		<category><![CDATA[Earth & Space]]></category>
		<category><![CDATA[Earth Science]]></category>
		<category><![CDATA[Earth and Space Science]]></category>
		<category><![CDATA[Earth's history]]></category>
		<category><![CDATA[Food]]></category>
		<category><![CDATA[Genetic revolution]]></category>
		<category><![CDATA[Grades 5-8]]></category>
		<category><![CDATA[Grades 9-12]]></category>
		<category><![CDATA[Health]]></category>
		<category><![CDATA[Life Science]]></category>
		<category><![CDATA[Origin and evolution of the earth system]]></category>
		<category><![CDATA[Personal and community health]]></category>
		<category><![CDATA[Personal health]]></category>
		<category><![CDATA[Reproduction and heredity]]></category>
		<category><![CDATA[Science in Personal and Social Perspectives]]></category>
		<category><![CDATA[atherosclerosis]]></category>
		<category><![CDATA[bowerbird mating]]></category>
		<category><![CDATA[chocolate]]></category>
		<category><![CDATA[Diamonds in Canada]]></category>
		<category><![CDATA[evolution]]></category>
		<category><![CDATA[female choice]]></category>
		<category><![CDATA[Valentine's Day]]></category>

		<guid isPermaLink="false">http://whyfiles.org/?p=520</guid>
		<description><![CDATA[Diamonds, mating and chocolate: three necessities of Valentine's Day.]]></description>
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		<title>Global Warming: Old Records, New Evidence</title>
		<link>http://whyfiles.org/2001/global-warming-new-evidence-from-old-records/</link>
		<comments>http://whyfiles.org/2001/global-warming-new-evidence-from-old-records/#comments</comments>
		<pubDate>Tue, 11 Sep 2001 15:04:50 +0000</pubDate>
		<dc:creator>schulte</dc:creator>
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		<category><![CDATA[Earth & Space]]></category>
		<category><![CDATA[Earth and Space Science]]></category>
		<category><![CDATA[Earth's history]]></category>
		<category><![CDATA[Environment]]></category>
		<category><![CDATA[Grades 5-8]]></category>
		<category><![CDATA[Grades 9-12]]></category>
		<category><![CDATA[Origin and evolution of the earth system]]></category>
		<category><![CDATA[Science as Inquiry]]></category>
		<category><![CDATA[Understanding about scientific inquiry]]></category>
		<category><![CDATA[climate change]]></category>
		<category><![CDATA[climatology]]></category>
		<category><![CDATA[global warming]]></category>
		<category><![CDATA[ice off]]></category>
		<category><![CDATA[ice on]]></category>
		<category><![CDATA[John Magnuson]]></category>
		<category><![CDATA[lake ice records]]></category>
		<category><![CDATA[limnology]]></category>
		<category><![CDATA[paleoclimatology]]></category>
		<category><![CDATA[river ice records]]></category>

		<guid isPermaLink="false">http://whyfiles.org/?p=590</guid>
		<description><![CDATA[New evidence from records of lake ice freezing and thawing is evidence for global warming.]]></description>
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		<title>Isotopes in Anthropology &amp; Biology</title>
		<link>http://whyfiles.org/1999/isotopic-astonishment/</link>
		<comments>http://whyfiles.org/1999/isotopic-astonishment/#comments</comments>
		<pubDate>Wed, 24 Mar 1999 19:45:32 +0000</pubDate>
		<dc:creator>schulte</dc:creator>
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		<category><![CDATA[Earth and Space Science]]></category>
		<category><![CDATA[Earth's history]]></category>
		<category><![CDATA[Grades 5-8]]></category>
		<category><![CDATA[Grades 9-12]]></category>
		<category><![CDATA[Origin and evolution of the earth system]]></category>
		<category><![CDATA[Paleontology & archeology]]></category>
		<category><![CDATA[Science and Technology]]></category>
		<category><![CDATA[Science history & process]]></category>
		<category><![CDATA[Technology]]></category>
		<category><![CDATA[Understandings about science and technology]]></category>
		<category><![CDATA[isotopes in anthropology]]></category>
		<category><![CDATA[isotopes in biology]]></category>
		<category><![CDATA[migration]]></category>
		<category><![CDATA[monarch butterfly]]></category>

		<guid isPermaLink="false">http://whyfiles.org/?p=796</guid>
		<description><![CDATA[Isotope analysis help track monarch butterfly migration; also used for dating specimens in anthropology and biology.]]></description>
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		<title>Killer Asteroids: Ultimate Impact</title>
		<link>http://whyfiles.org/1998/ultimate-impact/</link>
		<comments>http://whyfiles.org/1998/ultimate-impact/#comments</comments>
		<pubDate>Wed, 04 Nov 1998 18:14:13 +0000</pubDate>
		<dc:creator>schulte</dc:creator>
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		<category><![CDATA[By Theme]]></category>
		<category><![CDATA[Earth and Space Science]]></category>
		<category><![CDATA[Earth in the solar system]]></category>
		<category><![CDATA[Earth's history]]></category>
		<category><![CDATA[Grades 5-8]]></category>
		<category><![CDATA[Grades 9-12]]></category>
		<category><![CDATA[Motions and forces]]></category>
		<category><![CDATA[Natural]]></category>
		<category><![CDATA[Natural and human-induced hazards]]></category>
		<category><![CDATA[Natural hazards]]></category>
		<category><![CDATA[Origin and evolution of the universe]]></category>
		<category><![CDATA[Physical Science]]></category>
		<category><![CDATA[Science in Personal and Social Perspectives]]></category>
		<category><![CDATA[Space & astronomy]]></category>
		<category><![CDATA[asteroid science]]></category>
		<category><![CDATA[comets]]></category>
		<category><![CDATA[extinction]]></category>
		<category><![CDATA[killer asteroids]]></category>
		<category><![CDATA[near-Earth objects]]></category>

		<guid isPermaLink="false">http://whyfiles.org/?p=740</guid>
		<description><![CDATA[New searches are finding lots of asteroids. None of them are aimed at us -- yet. How much damage have asteroids done in the past?]]></description>
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		<title>Polar Science</title>
		<link>http://whyfiles.org/1998/polar-science/</link>
		<comments>http://whyfiles.org/1998/polar-science/#comments</comments>
		<pubDate>Sat, 04 Apr 1998 15:18:38 +0000</pubDate>
		<dc:creator>schulte</dc:creator>
				<category><![CDATA[All]]></category>
		<category><![CDATA[By Subject]]></category>
		<category><![CDATA[By Theme]]></category>
		<category><![CDATA[Earth & Space]]></category>
		<category><![CDATA[Earth Science]]></category>
		<category><![CDATA[Earth and Space Science]]></category>
		<category><![CDATA[Earth's history]]></category>
		<category><![CDATA[Energy in the earth system]]></category>
		<category><![CDATA[Environment]]></category>
		<category><![CDATA[Grades 5-8]]></category>
		<category><![CDATA[Grades 9-12]]></category>
		<category><![CDATA[Origin and evolution of the earth system]]></category>
		<category><![CDATA[TAP]]></category>
		<category><![CDATA[Antarctic science research]]></category>
		<category><![CDATA[Arctic]]></category>

		<guid isPermaLink="false">http://whyfiles.org/?p=597</guid>
		<description><![CDATA[What's new in polar science? What do seals do under the ice? How did humans cross the Bering Strait to reach North America? What does ancient metal tell us about ancient people?]]></description>
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		<item>
		<title>Dinos 4 Sale! (A Good Idea?)</title>
		<link>http://whyfiles.org/1996/dinos-4-sale/</link>
		<comments>http://whyfiles.org/1996/dinos-4-sale/#comments</comments>
		<pubDate>Thu, 05 Dec 1996 17:49:21 +0000</pubDate>
		<dc:creator>schulte</dc:creator>
				<category><![CDATA[All]]></category>
		<category><![CDATA[Biology]]></category>
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		<category><![CDATA[By Theme]]></category>
		<category><![CDATA[Earth and Space Science]]></category>
		<category><![CDATA[Earth's history]]></category>
		<category><![CDATA[Grades 5-8]]></category>
		<category><![CDATA[Grades 9-12]]></category>
		<category><![CDATA[History and Nature of Science]]></category>
		<category><![CDATA[Paleontology & archeology]]></category>
		<category><![CDATA[Science as a human endeavor]]></category>
		<category><![CDATA[Social Science]]></category>
		<category><![CDATA[Black Hills Institute of Geological Research]]></category>
		<category><![CDATA[dinosaurs]]></category>
		<category><![CDATA[fossil ownership]]></category>
		<category><![CDATA[paleontology]]></category>
		<category><![CDATA[Peter Larson]]></category>
		<category><![CDATA[Sue]]></category>
		<category><![CDATA[Tyrannosaurus rex]]></category>
		<category><![CDATA[who owns fossils?]]></category>

		<guid isPermaLink="false">http://whyfiles.org/?p=521</guid>
		<description><![CDATA[Tyrannosaurus Sue, raised questions about who owns dinosaur fossils. Should they jut go to the highest bidder, or should they have special status as scientific objects?]]></description>
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		<title>Amber: The Natural Preservative</title>
		<link>http://whyfiles.org/1996/amber/</link>
		<comments>http://whyfiles.org/1996/amber/#comments</comments>
		<pubDate>Tue, 27 Feb 1996 13:30:39 +0000</pubDate>
		<dc:creator>schulte</dc:creator>
				<category><![CDATA[All]]></category>
		<category><![CDATA[Biology]]></category>
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		<category><![CDATA[By Theme]]></category>
		<category><![CDATA[Earth and Space Science]]></category>
		<category><![CDATA[Earth's history]]></category>
		<category><![CDATA[Grades 5-8]]></category>
		<category><![CDATA[Grades 9-12]]></category>
		<category><![CDATA[History and Nature of Science]]></category>
		<category><![CDATA[Life Science]]></category>
		<category><![CDATA[Nature of scientific knowledge]]></category>
		<category><![CDATA[Paleontology & archeology]]></category>
		<category><![CDATA[Understandings about science and technology]]></category>
		<category><![CDATA[amber]]></category>
		<category><![CDATA[ancient bacteria]]></category>
		<category><![CDATA[ancient insects]]></category>
		<category><![CDATA[archeology]]></category>
		<category><![CDATA[Baltic amber]]></category>
		<category><![CDATA[paleontology]]></category>
		<category><![CDATA[Raul Cano]]></category>
		<category><![CDATA[tree resin]]></category>

		<guid isPermaLink="false">http://whyfiles.org/?p=501</guid>
		<description><![CDATA[How amber is used in archeology and paleontology: Reviving ancient bacteria, viewing ancient insects, what's not to love about amber?]]></description>
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