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  1. Health & Medicine

    3-D maps of a protein show how it helps organs filter out toxic substances

    Images of LRP2 in simulated cell environments reveal the structural changes that let it catch molecules outside a cell and release them inside.

    By McKenzie Prillaman
  2. Health & Medicine

    A chemical imbalance doesn’t explain depression. So what does?

    The causes of depression are much more complex than the serotonin hypothesis suggests

    By Laura Sanders
  3. Animals

    Cockatoos can tell when they need more than one tool to swipe a snack

    Cockatoos know when it will take a stick and a straw to nab a nut in a puzzle box. The birds join chimps as the only known nonhumans to use a tool kit.