News

  1. Tech

    Soaring at Hyperspeed: Long-sought technology finally propels a plane

    For the first time, an airplane flew at hypersonic speed under power of a scramjet, an engine that operates at high velocities using oxygen from the atmosphere.

    By Peter Weiss
  2. 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
  3. 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.