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  1. From the April 10, 1937, issue

    Living pearls and a clue to atomic structure.

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  2. Earth

    Greaseball Challenge

    And they’re off! The participants in this charity biofuel car rally are on their way from the U.S. East Coast to San Jose, Costa Rica. Powered by biodiesel, vegetable oil, waste grease, and other alternative fuels, the vehicles will all be donated to local communities at the end of the rally, which runs until April […]

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  3. Anthropology

    Disinherited Ancestor: Lucy’s kind may occupy evolutionary side branch

    A controversial analysis of a recently discovered jaw from a 3-million-year-old Australopithecus afarensis puts Lucy's species on an evolutionary side branch that eventually died out.