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  1. 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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  2. 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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  3. Space

    Atom & Cosmos

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

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  4. Tools tell a more complicated tale of the origin of the human genus

    The first animals that could arguably be called “human” made the evolutionary scene a little less than 2 million years ago.