A remarkable study carried out by Harvard University [is] detailed in Dr. Joe Dispenza's fascinating new book You are the Placebo. In 1981, eight men in their 70s and 80s attended a five-day retreat at a monastery in Peterborough, New Hampshire, organized by Harvard University, where they were asked to pretend that they were 22 years younger than their present age. When they got there, they discovered constant reminders of two decades previously: old issues of Life magazine and the Saturday Evening Post, shows on TV that had been popular in the late 50s, radios playing Perry Como and Nat King Cole. The men were asked to discuss events that had been current two decades before: Fidel Castro's sudden ascendancy to power in Cuba, Nikita Khrushchev's stand-off with Eisenhower in a US meeting, homeruns hit by Mickey Mantle and knock-out punches by Floyd Patterson. This carried on throughout the five days of the retreat. After the retreat ended, the researchers took the same physiological measurements they'd carried out at start of the study and discovered that the men actually had grown 'taller'; they showed improved height, weight and gait, their postured straightened, their joints had become more flexible, their hearing, eyesight, grip strength, memory and general mental cognition had all improved. In fact, by the end of the five days, many of these octogenarians had given up their canes and were playing touch football. Once they'd been reminded of their younger selves, their bodies actually became younger - and all in less than a week. 'The change wasn't just in their minds,' wrote Dispenza, 'it was also in their bodies.'