Every day, the human body loses and replaces millions of skin cells.
Why it is true
The human body loses about 30,000 to 40,000 dead cells per hour — about 1.5 kg of skin per year.
Source: Dermatology
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This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.