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  1. Health & Medicine

    Immune booster also works in reverse

    Injections of the protein interleukin-2 can calm runaway defenses that damage tissues in the body, two studies show.

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  2. Health & Medicine

    Weaker brain links found in psychopaths

    Decreased communication between emotional and executive centers may contribute to the mental disorder.

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  3. Space

    Christmas gamma-ray burst still puzzles

    Nearly a year after receiving a spectacular celestial gift, astrophysicists are still asking: “What is it?”

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  4. Space

    Superbubble harbors cosmic rays

    Stellar nursery jump-starts rays’ journey to Earth.

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  5. Life

    Biology’s big bang had a long fuse

    The fossil record’s earliest troves of animal life are the result of more than 200 million years of evolution.