Thomas Edison has some thoughts about dandruff

“It has just occurred to me that the brain may digest certain portions of food, say the ethereal part, as well as the stomach – perhaps dandruff is the excreta of the mind – the quantity of this material being directly proportional to the amount of reading one indulges in. A book on German metaphysics would easily ruin a dress suit . . .”

– Thomas Edison, July 12, 1885

(From The New York Diaries, ed Teresa Carpenter)

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