Humans lose about 100 hairs per day.
Why it is true
Humans lose between 50 and 100 hairs per day, on average. Hair grows about 1.25 centimetres per month and each follicle goes through phases of growth, transition and rest before falling out.
Source: NIH
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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.