News

  1. Archaeology

    Was Egypt’s first pyramid built with hydraulics? The theory may hold water

    A controversial analysis contends that ancient engineers designed a water-powered elevator to hoist stones for King Djoser’s pyramid.

    By Bruce Bower
  2. Animals

    Pheromone fingers may help poison frogs mate

    Specialized glands in the fingertips of some males may produce seductive chemical signals.

    By Jake Buehler
  3. Neuroscience

    Alzheimer’s blood tests are getting better, but still have a ways to go

    Blood biomarker tests could help doctors know if a person's cognitive symptoms are due to Alzheimer's or something else.

    By Laura Sanders
  4. Chemistry

    Tycho Brahe dabbled in alchemy. Broken glassware is revealing his recipes

    The shards contain nine metals that the famous astronomer may have used, including one not formally identified until 180 years after his death.