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  1. Life

    Around 13,000 years ago, humans and fire changed LA’s ecosystem forever

    Rapid drying combined with human-made fires changed Southern California forever, killing off ancient bison, dire wolves and five other megafauna species there.

    By Jake Buehler
  2. Genetics

    A new look at Ötzi the Iceman’s DNA reveals new ancestry and other surprises

    Ötzi had genetic variants for male-pattern baldness and dark skin, and he also had an unusual amount of early farmer ancestry, a new DNA analysis finds.

    By Tina Hesman Saey
  3. Chemistry

    Magnetic ‘rusty’ nanoparticles pull estrogen out of water

    Iron oxide particles adorned with “sticky” molecules trap estrogen in water, possibly limiting the hormone’s harmful effects on aquatic life.