News

  1. Health & Medicine

    Record low for human blood oxygen levels

    Study of Mt. Everest climbers shows some bodies can tolerate low oxygen levels that are toxic to others.

    By Rachel Ehrenberg
  2. Health & Medicine

    Early C-sections pose risks

    Babies delivered by elective cesarean section just a week or two before 39 weeks of gestation face increased risk of respiratory and other complications.

    By Nathan Seppa
  3. Space

    In the young universe, black holes may have formed first

    Findings pose a possible answer to long-standing question of when the black holes at galactic centers formed.

    By Ron Cowen
  4. Earth

    Early asteroids unexpectedly crusty

    Two meteorites retrieved from West Antarctica, fragments of an ancient asteroid, contain a type of rock commonly found in Earth’s crust but previously unseen in meteorites.