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  1. 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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  2. 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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  3. Genome from a bottle

    Back Story: Cracking the code.

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  4. Physics

    Law & Disorder: A Companion

    More resources about how physicists and philosophers understand time.

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  5. Law & Disorder

    Physicists keep trying to explain why time flows one way.