As every woman knows, men with mother issues are seriously dangerous. In the early- to mid-20th century, there was a group of such men that decided it could revolutionize the way mothers raise their children. First of all, stop kissing them — lord knows what germs you’re passing on. And really, just put them in this box that B.F. Skinner calls a “baby tender,” throw some toys in there, and they’ll be fine. Don’t pick them up when they cry, and don’t play with them — they have to toughen up some day. While the baby tender failed to catch on outside Skinner’s own family, parenting guides and doctors were telling new mothers that too much affection would weaken their children both physically and emotionally.

Luckily for the world, their reign was short. Harry Harlow arrived on the scene with a smattering of his own mother issues. He became interested in studying the importance of the relationship between infant and mother, possibly because he thought he had been pushed aside as his own parents cared for his ill brother.

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