News

  1. Health & Medicine

    MRIs pinpoint time of stroke

    Doing a magnetic resonance scan promptly when a patient arrives at a hospital could render more patients eligible for a time-sensitive clot-busting therapy that can limit brain damage.

    By Nathan Seppa
  2. Chemistry

    Skin is no barrier to BPA, study shows

    The new finding suggests handling store receipts could be a significant source of internal exposure to the hormone-mimicking chemical.

    By Janet Raloff
  3. Earth

    Arctic lake yields climate record

    A Siberian drilling project goes to great lengths to capture an ancient climate record in a 3.6 million-year-old crater.

    By Alexandra Witze
  4. Physics

    Entanglement loophole closed

    A long-distance experiment rejects a challenge to quantum physics.