William Masters and Virginia Johnson became famous in the 1960s for their groundbreaking and controversial research into the physiology of human sexuality. Instead of just asking people about their sex lives, Masters and Johnson actually observed volunteers engaging in self-stimulation and sexual intercourse. Changes throughout their bodies during arousal were measured with medical equipment.
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We don't often think of professional athletes improving with age, but Jamie Moyer was a better pitcher in his 40s than he was in his 20s. Moyer became the oldest pitcher to win a Major League Baseball game when, in April 2012, at the age of 49 years, 150 days, he pitched the Colorado Rockies to a 5-3 win over the San Diego Padres.