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  1. Plants

    Forest invades tundra

    The Arctic tundra is under assault from trees, with serious implications for global climate change.

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  2. Chemistry

    Catching your breath

    Scientists are investigating how to use the human breath to diagnose diseases and environmental ills.

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  3. Humans

    Worth the cooties

    Boys who attend preschool classes with a majority of girls do better developmentally than other boys.

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  4. Animals

    Peril of play

    A new study shows that playful 2-year-old chimpanzees may be particularly vulnerable to infectious diseases — some caught from humans.

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  5. Math

    The tell-tale anecdote

    An Edgar Allan Poe story reveals a flaw in game theory.