What are the benefits of black hair?

First of all, I think it is the result of natural selection. Black hair can block harmful light, thus protecting the scalp.

Secondly, black and bright hair itself is a kind of beauty.

Finally, hair, as a part of the body, also reflects the health of the body, which is usually directly related to internal organs.

So we can observe other parts of the body according to the state of hair. As the saying goes, it makes sense to pull one hair and move the whole body

Not just pulling a hair!