Staring down a packed room at the Hyatt Regency Hotel in downtown San Francisco this March, Randy Gallistel gripped a wooden podium, cleared his throat, and presented the neuroscientists sprawled before him with a conundrum. “If the brain computed the way people think it computes," he said, "it would boil in a minute." All that information would overheat our CPUs. Humans have been trying to understand the mind for millennia.

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