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  1. Genetics

    Ancient DNA pushes back timing of the origin of dogs

    DNA extracted from the fossil of an ancient wolf indicates dogs and wolves diverged longer ago than previously thought.

    By Tina Hesman Saey
  2. Animals

    Octopuses can ‘see’ with their skin

    Eyes aren’t the only cephalopod body parts with light-catching molecules.

    By Susan Milius
  3. Materials Science

    Like a balloon, peculiar magnet grows and shrinks

    A recently discovered alloy of iron and gallium can expand and contract like a balloon when exposed to a magnetic field.

    By Andrew Grant
  4. Archaeology

    Earliest known stone tools unearthed in Kenya

    East African discoveries suggest stone-tool making started at least 3.3