10 pieces of wisdom from 'Because I Said So'

Here are 10 of "mom myths "from Jennings' new book in which he questions family wisdom.

8. Cracking your knuckles will give you arthritis

Paulo Whitaker/Reuters

No connection has been made between people who developed arthritis and those who cracked their knuckles when they were younger. In one extreme example, researcher Donald Unger cracked the knuckles on his left hand at least twice a day as an experiment into the claim and never had arthritis in either hand.

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