News

  1. Earth

    Tough meteorite made a big impact

    The stony meteorite that landed in a remote portion of Peru in September 2007 was traveling abnormally fast when it struck and blasted a crater that was unusually large for the its size, new analyses indicate.

    By Sid Perkins
  2. Life

    X chromosome is extra diverse

    Men who father children with multiple women are responsible for “extra” diversity on the X chromosome, a new study of six different populations suggests.

    By Tina Hesman Saey
  3. Life

    Safer creation of stem cells

    A new technique for converting adult cells to stem cells avoids dangerous mutations in cell DNA

    By Patrick Barry
  4. Humans

    Teaching babies to err

    A puzzling error that infants make in a hiding game arises from their inherent tendency to interpret others’ behavior, a research team contends.