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  1. Physics

    Prying apart antimatter

    Matter and antimatter look reassuringly alike in physicists' first investigations of energy levels of antihydrogen atoms.

    By Peter Weiss
  2. Physics

    Prying apart antimatter

    Matter and antimatter look reassuringly alike in physicists' first investigations of energy levels of antihydrogen atoms.

    By Peter Weiss
  3. Health & Medicine

    Herpes vaccine progresses

    A new vaccine for genital herpes protects some women but not men.

    By Nathan Seppa
  4. Health & Medicine

    Herpes vaccine progresses

    A new vaccine for genital herpes protects some women but not men.

    By Nathan Seppa
  5. Paleontology

    New fossil weighs in on primate origins

    A 55-million-year-old primate skeleton found in Wyoming indicates that the common ancestor of modern monkeys, apes, and people was built primarily for hanging tightly onto tree branches.