Fish Fossil Suggests Ancient Push-Ups

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Study: Ferns Younger, 'Smarter' Than Believed

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Value of Heart Disease Test Questioned

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Human Diseases Mirrored in Rat Genome

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Saving the World's Spineless

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U.S. Firm Wants to Test All Cattle for Mad Cow

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Panel Calls for Rules on Embryo Use

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Safety of Generic AIDS Drugs Debated

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Future of Nuclear Energy in the U.S.

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Genetic Ethics: 'Against Perfection'

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How NASA Averted Mars Rover Crisis

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NASA to Test 'Scramjet' Aircraft

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U.S. Picks Medicare Drug-Card Providers

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Researchers Decode Malaria Link

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