Notebook

  1. Oceans

    Underwater city was built by microbes, not people

    Submerged stoneworklike formations near the Greek island of Zakynthos were built by methane-munching microbes, not ancient Greeks.

    By Thomas Sumner
  2. Life

    Artificial hearing has come a long way since 1960s

    Scientists envisioned artificial hearing 50 years ago. Today, they are working to make it superhuman.

    By Cassie Martin
  3. Animals

    To zip through water, swordfish reduce drag

    A newly discovered oil-producing organ inside the swordfish’s head gives the animal slick skin to swim faster.

    By Laurel Hamers
  4. Physics

    Sounds from gunshots may help solve crimes

    Sound wave analysis may help forensic scientists figure out what types of guns were fired at a crime scene.