It's been speculated that Sidis's intelligence was due in part to having thin-walled blood vessels in the brain, making it easy for nutrients like oxygen to dif

It's been speculated that Sidis's intelligence was due in part to having thin-walled blood vessels in the brain, making it easy for nutrients like oxygen to diffuse into brain cells. This theory explains his and his fathers' premature deaths due to stroke. It also suggests that ordinary people today might increase their intelligence by trying to eliminate arterial plaque.