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  1. Physics

    You really can freeze hot water faster than cold*

    Experiments suggest that impurities in the warmer water may explain the “Mpemba effect” in which warm water freezes faster than cold water.

    By Laura Sanders
  2. Health & Medicine

    UV radiation, not vitamin D, might limit multiple sclerosis symptoms

    The rarity of MS in the tropics may be due to higher ultraviolet light exposure, not necessarily increased vitamin production, new research suggests.

    By Nathan Seppa
  3. Life

    Hawaiian caterpillars are first known amphibious insects

    Developing underwater or above, it’s all good for moths that evolved new lifestyle in the islands

    By Susan Milius
  4. Anthropology

    Ancient footprints yield oldest signs of upright gait

    Human ancestors may have been walking with an efficient, extended-leg technique by 3.6