APS Past-President/ Author: Lisa Feldman Barrett
Five hundred million years ago, a tiny sea creature changed the course of history: It became the first predator. It somehow sensed the presence of another creature nearby, propelled or wiggled its way over, and deliberately ate it.
This new activity of hunting started an evolutionary arms race. Over millions of years, both predators and prey evolved more complex bodies that could sense and move more effectively to catch or elude other creatures.
Eventually, some creatures evolved a command center to run those complex bodies. We call it a brain.
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