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  1. Physics

    Too speedy for gravity?

    A new analysis suggests that five different spacecraft gained more speed as they flew past Earth than can be accounted for by Einstein's theory of gravitation.

    By Ron Cowen

  2. 19933

    This article was extremely well written! It was engaging and clear. Thank you! Katherine MuzikOkinawa, Japan

    By Science News

  3. The Next Ocean

    Increasing carbon dioxide in the air is changing the pH of the ocean, which could mean very different communities of sea creatures.

    By Susan Milius
  4. Health & Medicine

    Beyond Blood

    Bloodless MRI seeks a more direct window into the working brain than conventional techniques.

    By Ewen Callaway
  5. Astronomy

    Supernova Outbreak: X rays signal earliest alert

    Thanks to a lucky break and an overactive galaxy, astronomers report the earliest detection yet of a normal supernova—the explosive death of a massive star.