Nikola Tesla once said of Thomas Edison:  “He had no hobby, cared for no sort of  amusement of any kind, and lived in utter  disregard of the most elementary rules  of hygiene. His method was inefficient in  the extreme…he had a veritable contempt  for book learning and mathematical  knowledge, trusting himself entirely to  his inventor’s instinct and practical  American sense.”  

(Source, Source 2)