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human

  • Fish can recognize different human faces. (Chrumps, Wikimedia Commons)
    Fish Can Recognize Human Faces
    Paul Patton
    How do people recognize faces? Is it a special ability that relies on custom circuitry in the human brain? Or, do we learn it with the same brain circuitry that we use to recognize other objects?
  • Bacteria in the urinary tract can cause infections. (Wikimedia Commons)
    Bacterial Hooks
    Jeremy Shere
    Many women get a urinary tract infection at some point, and they are quite painful. The infection is caused by bacteria that enter the body through the urethra to colonize the bladder.