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  1. Health & Medicine

    The other, friendly fat

    Brown fat is active in adult humans and could help keep people lean.

    By Tina Hesman Saey
  2. Health & Medicine

    Acid reflux link to asthma now in doubt

    Heartburn drugs called proton pump inhibitors, commonly prescribed for asthma patients, don’t prevent breathing attacks.

    By Nathan Seppa
  3. Earth

    Nickel down, oxygen up

    Researchers point to the early ocean's concentration of nickel as the possible start for events that allowed Earth's atmosphere to accumulate oxygen.

    By Solmaz Barazesh
  4. Life

    Male chimps exchange meat for sex

    A long-term study of chimps living in western Africa indicates that males hunt down monkeys not only to eat their meat, but also to exchange the meat for sex with female chimps.