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  1. Life

    Fountain of Youth, with caveats

    A chemical in red wine thought to mimic the life-extending properties of calorie restriction improves health, but doesn’t necessarily lengthen life; it could also harm the brain.

    By Tina Hesman Saey
  2. Life

    Embryos can learn visually

    For cuttlefish embryos, what they see is what they'll crave as food later

    By Susan Milius
  3. Chemistry

    HIV knockout

    Cutting a gene in immune cells could offer a new way to treat HIV infections.

    By Patrick Barry
  4. Earth

    Precious little gems

    Ancient microdiamonds embedded inside ancient zircons found in western Australia suggest that life may have existed on Earth up to 4.25