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  1. Animals

    Pheromone fingers may help poison frogs mate

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

    By Jake Buehler
  2. Climate

    Climate change is driving the extreme heat baking France’s Olympics

    In this week’s Extreme Climate Update, we look at record-breaking temps around the world and explain what the heat index is.

    By Nikk Ogasa
  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.