statistic
Neurons, counted rather than guessed
Neuroscience
86B
billion neurons in an adult human brain
The hundred billion figure in every textbook was never measured; it was a round number that got repeated. The first actual count, by dissolving brains into a cell soup and counting nuclei, came in lower.
About eleven neurons for every person alive, or roughly the number of stars in a small galaxy
Azevedo et al., Journal of Comparative Neurology, 2009, using the isotropic fractionator
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