Uncategorized

  1. Astronomy

    Are most extrasolar planets hefty imposters?

    A new study makes the startling claim that nearly half the objects reported to be extrasolar planets are something much more massive and mundane—either lightweight stars or stellar wannabes known as brown dwarfs.

    By Ron Cowen
  2. Health & Medicine

    Study bolsters head injury, Alzheimer’s link

    Veterans who suffered a moderate or severe concussion during World War II face a heightened risk of Alzheimer's disease when they reach old age.

    By Nathan Seppa

  3. It’s a boy! It’s a girl! It’s a mosaic embryo

    Using a new technique to examine chromosomes of in vitro fertilization (IVF) embryos at the time they're implanted in the womb, researchers report abnormalities never seen later in development, possibly explaining why IVF has a low efficiency.