Most people endure acne at some point, and can't wait to be rid of the combination of whiteheads, blackheads, pimples, and pustules.
Ironically, the general covering of our bodies in hair — what we call “fur” on other animals — is at the root of our problem with acne.
This Moment of Science will answer a question that must have been gnawing at you since you first noticed that human males have nipples.
As a boy goes through adolescence, his secondary sex characteristics develop. One of these characteristics is the rapid growth of the larynx and vocal cords. A boy’s voice deepens as his larynx develops because the bigger the vocal cords, the deeper the voice.