News

  1. Materials Science

    Heal thyself—again and again

    A new self-healing material can repeatedly repair damage at the same spot.

    By Sarah Webb
  2. Earth

    Tree rings tell tale of megadroughts

    Tree rings in ancient timber show that the Colorado Plateau experienced a 60-year drought in the 12th century.

    By Sid Perkins
  3. Animals

    Moths mimic ‘Don’t eat me’ sounds

    Moths that make clicking noises at predatory bats are mimicking a defensive signal made by other moths that click and also taste bad.

    By Susan Milius
  4. Archaeology

    Ancient beads found in northern Africa

    Perforated shells found in a Moroccan cave indicate that northern Africans made symbolic body ornaments 82,000 years ago, long before Europeans did.