News

  1. Archaeology

    Human ancestors made the oldest known bone tools 1.5 million years ago

    The excavation of bone tools at Olduvai Gorge in Tanzania expands the range of ancient hominids’ cultural innovations.

    By Bruce Bower
  2. Astronomy

    The Milky Way’s black hole is constantly bubbling

    The disc of plasma surrounding the black hole at the heart of the Milky Way is constantly emitting flares both large and small.

    By Lisa Grossman
  3. Animals

    Crickets and flies face off in a quiet evolutionary battle

    Male crickets in Hawaii softened their chirps once parasitic flies started hunting them. Now, it seems, the flies are homing in on the new tunes.

    By Jake Buehler
  4. Physics

    The sound of clapping, explained by physics

    The “Helmholtz resonator” concept explains the frequencies of sound produced by clapping the hands together in different configurations.