News

  1. Planetary Science

    Oxygen leaking from comet surprises astronomers

    The Rosetta spacecraft detected oxygen molecules coming out of comet 67P that might have been buried since the formation of the solar system.

    By Christopher Crockett
  2. Life

    Rare reptile holds clue to penis evolution

    Preserved Victorian specimens reveal budding embryonic penis that disappears before adulthood.

    By Susan Milius
  3. Health & Medicine

    Daily drug shown effective in preventing HIV infections

    After a history of controversy, preexposure prophylaxis has been demonstrated to work for HIV prevention.

    By Laura Beil
  4. Health & Medicine

    Eating meat officially raises cancer risk

    Eating processed meats like bacon, ham and sausage causes cancer, says the World Health Organization.