Give me a dozen healthy infants, well-formed, and my own specific world to bring them up in, and I’ll guarantee to take any one at random and train him to become any type of specialist I might select – a doctor, lawyer, artist, merchant-chief and, yes, even into a beggar-man and thief, regardless of his talents, penchants, tendencies, abilities, vocations and race of his ancestors.
J. B. Watson, Psychologies of 1925