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  1. Life

    This ancient worm might be an important evolutionary missing link

    A roughly 520-million-year-old fossil may be the common ancestor of a diverse collection of marine invertebrates.

    By Allison Gasparini
  2. Archaeology

    Drone photos reveal an early Mesopotamian city made of marsh islands

    Urban growth around 4,600 years ago, near what is now southern Iraq, occurred on marshy outposts that lacked a city center.

    By Bruce Bower
  3. Paleontology

    Dinosaur ‘mummies’ may not be rare flukes after all

    Bite marks on a fossilized dinosaur upend the idea that exquisite skin preservation must result from a carcass's immediate smothering under sediment.

    By Jake Buehler
  4. Neuroscience

    Clumps of human nerve cells thrived in rat brains

    New results suggest that environment matters for the development of brain organoids, 3-D nerve cell clusters that grow and mimic the human brain.