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  1. Health & Medicine

    Too Much of a Good Thing: Excess vitamin A may hike bone-fracture rate

    Dietary studies suggest that people who consume large amounts of vitamin A in foods or multivitamins are more likely to suffer hip fractures than are people who ingest modest amounts.

    By Nathan Seppa
  2. Tech

    Fiber Helper: Minuscule controllers may open data floodgates

    A device that fits on the end of optical fibers may make possible the next big boost in Internet speed without new underground cables.

    By Peter Weiss
  3. Astronomy

    In the Beginning: Dark matter builds galaxies, feeds quasars

    Cosmologists say they have found compelling evidence that massive galaxies were already in place when the universe was less than a billion years old.