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  1. Humans

    Ancient blades served as early weapons

    African find reveals complex toolmaking 71,000 years ago.

    By Erin Wayman
  2. Health & Medicine

    Highlights from the American Heart Association Scientific Sessions, Los Angeles, November 3-7

    Multivitamins may not reduce heart attacks, two drugs could protect heart from chemo damage, and more.

    By Nathan Seppa
  3. Health & Medicine

    Your brain on speed dating

    Activity in two regions helps calculate compatibility with potential mates.

    By Laura Sanders
  4. Life

    A little radiation is good for mice

    Low doses of radioactivity led to healthier pups.

    By Tina Hesman Saey
  5. Life

    Cancer cells self-destruct in blind mole rats

    Underground rodents evolved a way to zap mutating tissue.