Intro

How many neurons does the typical human brain contain? The oft-quoted number of 100 billion turns out to have been a guess that was wrong! By a lot! Dr. Suzana Herculano-Houzel is the Brazilian neuroscientist who developed a revolutionary new technique for accurately counting the neurons in brains of all sizes. She shocked the scientific community when she determined that the average human brain contains only 86 billion neurons, but we still have more neurons in our cerebral cortex than any other species. Learn what all this means in Brain Science 133.

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