The human brain is puzzling — it is curiously large given the size of our bodies, uses a tremendous amount of energy for its weight and has a bizarrely dense cerebral cortex. But: why? Neuroscientist Suzana Herculano-Houzel puts on her detective`s cap and leads us through this mystery. By making "brain soup," she arrives at a startling conclusion.

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https://www.ted.com/talks/suzana_herculano_houzel_what_is_so_special_about_the_human_brain