Knuckle Cracking (1975)

Dr. Donald Unger was awarded the 2009 Ig Nobel Prize in medicine for his more than 60-year-long personal investigation of knuckle-cracking. Here’s an earlier, though much more time-compressed, study by other scientists: “The Consequences of Habitual Knuckle Cracking,” Robert L. Swezey and Stuart E. Swezey, Western Journal of Medicine, vol. 122, no. 5, May 1975, pp. 377–9. […]