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TIL that Dr Donald Unger, actually cracked the knuckles of his left hand at least twice a day for over 50 years whilst never cracking those on his right hand in order to prove his mother wrong – he never developed arthritis in either hand, and won an IgNobel award for his efforts in 2009.

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TIL that Dr Donald Unger, actually cracked the knuckles of his left hand at least twice a day for over 50 years whilst never cracking those on his right hand in order to prove his mother wrong – he never developed arthritis in either hand, and won an IgNobel award for his efforts in 2009.	1