News

  1. Astronomy

    Foraging among the Galaxies: Andromeda’s dining habits are documented

    A new survey is adding to the evidence that Andromeda, the Milky Way’s sister galaxy, has not only grown bigger in the past by feasting on smaller galaxies but is continuing to do so.

    By Ron Cowen
  2. Health & Medicine

    Better-Off Circumcised? Foreskin may permit HIV entry, infection

    Circumcision seems to offer partial protection against HIV infection, but not other sexually transmitted diseases.

    By Nathan Seppa
  3. Animals

    Long Horns Win: Selection in action—Attacks favor spike length for lizards

    A hunting bird's quirk—a tendency to impale prey on thorns—leaves a record that has allowed scientists to catch a glimpse of an evolutionary force in action.