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  1. Life

    A gland grows itself

    Japanese researchers coax a pituitary to develop from stem cells in a lab dish.

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  2. Life

    Prehistoric horses came in leopard print

    Dappled animals, once thought to be the result of selective breeding after domestication, were around when early humans depicted them on cave walls.

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  3. Life

    School rules

    Fish coordinate with one, or perhaps two, of their neighbors to make group travel a swimming success.

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  4. Paleontology

    DNA suggests North American mammoth species interbred

    Supposedly separate types may really have been one.

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  5. Life

    Giant beavers had hidden vocal talents

    With air passageways in its skull like no other animal known, an extinct outsized rodent may have made sound all its own.