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  1. Humans

    Secondhand smoke linked to mental distress

    A Scottish survey finds a link between exposure to cigarette smoke and serious emotional problems.

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  2. Planetary Science

    Before the Mississippi, minerals show ancient rivers flowed west

    Michigan zircons uncover the path of an ancient river system across North America.

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  3. Life

    Marine creature cooks up chemical defense from food

    The sea hare transforms a benign algal pigment into a noxious molecule to help ward off crabs and other predators, new studies show.

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  4. Physics

    A giant proposal for a new type of molecule

    Atoms linked across vast distances, can point in two directions at once

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  5. Genome from a bottle

    Back Story: Cracking the code.