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  1. Paleontology

    Alaska in the ice age: Was it bluegrass country?

    At the height of the last ice age, northern portions of Alaska and the Yukon Territory were covered with an arid yet productive grassland that supported an abundance of large grazing mammals, fossils suggest.

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  2. Animals

    Life Without Sex

    The search is on for creatures that have evolved for eons without sex.

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  3. Humans

    From the June 24, 1933, issue

    LIGHTNING Lightning, most awesome of the spectacular forces of nature, has yielded some of its mystery to science. But not all. We no longer credit it, as did our ancestors, to an angry Zeus or an impetuous Thor.