A 1930s psychologist enrolled a pair of unwitting subjects — his own infant and an adopted baby chimp — to test whether nurture triumphs over nature. Dr. Winthrop Niles Kellogg set his son, Donald, and his adopted daughter, Gua, in front of a movie camera. The psychologist wanted to capture a memory of the two babies, Donald in a white onesie and leather shoes, Gua in a diaper and similar shoes. The vignette in sunny Florida might have been cute, except that Donald was a human and Gua was a chimpanzee, and they were both subjects in Kellogg’s experiment. Kellogg and his wife, Luella, had adopted Gua from Cuba at 7-and-a-half months to see if a chimp would act like a human if raised with their 10-month-old son and surrounded by other people — a bizarre thesis in any era but especially in 1931, when chimps were rarely used for behavioral research. For nine months, Kellogg, his wife and other researchers meticulously observed the two babies, an experiment that today would alarm scientists, animal rights activists and child protective services. | 