News

  1. 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
  2. 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.

    By Bruce Bower
  3. Earth

    New contender for Earth’s oldest rocks

    Observing rare isotopes in rocks along the Hudson Bay in Northern Quebec suggest the rocks have remained intact for 4.28 billion years, making them Earth's oldest.

    By Sid Perkins
  4. Health & Medicine

    Window of opportunity for stroke treatment widens

    Use of clot-busting drugs as long as 4½ hours after an event pays dividends later.