News

  1. 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
  2. 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
  3. 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.

    By Bruce Bower
  4. Health & Medicine

    Diabetes drug might hike heart risk

    People who take rosiglitazone, a popular diabetes drug marketed as Avandia, may face an increased risk of heart attack.