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  1. Math

    Detangling DNA

    DNA can form some very nasty knots — but not just any knots.

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  2. Animals

    How they shine

    Iridescence could be pretty meaningful—or maybe just pretty.

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  3. Astronomy

    When Worlds Collide

    Parallel universes aren’t supposed to be observable, but a cosmic crash might leave a visible sign of their existence.

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  4. Earth

    Audubon’s insect cafeteria

    Sidebar: Insects.

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  5. Health & Medicine

    Insects (the original white meat)

    Dining on insects, usually more by choice than necessity, occurs in at least 100 countries — and may be better than chicken for both people and the environment.