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David
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How does hair know how long What determines the length to growwhich hair grows?

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TeoFriendly
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How does hair know how long to grow?

Correct me if i am wrong, if we cut 2mm from eyebrow hair, it will grow 2mm and then stop growing, or if we cut 5mm, then it will grow only 5mm. My question is, does hair know how long to grow ?