News

  1. Genetics

    Single exodus from Africa gave rise to today’s non-Africans

    Genetics and climate studies differ on when modern humans left Africa.

    By Tina Hesman Saey
  2. Ecosystems

    Shrinking sea ice threatens natural highways for caribou, plants

    As Arctic sea ice declines, Peary caribou or plants risk getting stranded when their frozen highways thaw.

    By Susan Milius
  3. Health & Medicine

    Activity trackers fall short in weight-loss trial

    In a two-year study, wearable activity monitors didn’t help young adults lose more weight.

    By Laura Sanders
  4. Earth

    Primordial continental crust re‑created in lab

    Compressing rocks from an ocean plateau at high temperatures and pressures re-creates the formation of Earth’s first continental crust.