News

  1. Space

    Stars’ plasma spurts may be blocked by magnetic fields

    The sun frequently flings plasma into space, but sightings of such eruptions on other stars are rare. Magnetic fields could explain why.

    By Emily Conover
  2. Paleontology

    These mammal ancestors birthed live young far earlier than thought

    Growth rings on a fossil bone suggest at least one mammal ancestor gave birth to live young rather than laying eggs 236 million years ago.

    By Carolyn Gramling
  3. Health & Medicine

    Estrogen therapy is linked to fewer signs of Alzheimer’s in the brain

    Estrogen-only menopause therapy in older women was linked to less Alzheimer’s brain pathology at autopsy but may not prevent the disease.