When Morgan looked at the pedigrees of families like the Kallikaks, he did not see undeniable proof of the heredity of feeblemindedness. He saw instead many generations of poor people suffering enduring hardships. "It is obvious that these groups of individuals have lived under demoralizing social conditions that might swamp a family of average persons," Morgan wrote.
( Carl Zimmer )
[ She Has Her Mother's Laugh: ]
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