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Humans lose 200,000,000 skin cells every hour. During a 24-hour period, a person loses almost five thousand million skin cells. It has been a challenge for scientists to explain how this colossal shedding process can occur without there being a break in the skin barrier.

SOURCE:

https://www.sciencedaily.com/releases/2016/11/161129114910.htm#:~:text=Humans%20lose%20200%2C000%2C000%20skin%20cells,break%20in%20the%20skin%20barrier.