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  1. Life

    In the dark, cave fish follows its own rhythm

    Scientists unwind an odd biological clock to better understand how organisms set daily cycles.

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  2. Chemistry

    Explosive goes boom, but not too soon

    Leavening a volatile new material with good old TNT yields a substance that’s safer to handle and easily reverted into a highly potent form.

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  3. Chemistry

    If that’s a TV, this must be the den

    In some situations, the brain identifies a location based on a checklist of objects.

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  4. Space

    Atom & Cosmos

    Long-lost Martian glaciers, ozone on Venus and more in this week’s news.