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  1. Chemistry

    Questions of Origin

    Two new studies renew controversy about the authenticity of a map that may be the first depiction of North America.

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  2. Chemistry

    Tums of the Sea

    Ocean scientists question whether the seas can handle rising carbon dioxide concentrations.

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  3. Anthropology

    Ancient populations were game for growth

    Archaeological evidence of a Stone Age shift in dietary preferences, from slow to swift small game, suggests that the human population rose sharply sometime between 100,000 and 50,000 years ago.

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  4. From the February 1, 1930, issue

    WHOSE MEMORY LIVES IN THIS EGYPTIAN TOMB? The great tomb of an unknown Egyptian who lived about 2800 B.C.