Category Archives: Science

Why Do People Have Toenails?

Nails, like human hair or the claws and hooves of animals, are made of keratin. New cells are formed in the root of the nail, hidden mostly under the skin. As new cells grow, the “old” ones are pushed out. According to Wikipedia, the speed with which toenails grow depends largely on the terminal phalanx… Read More »

Why Do We Yawn?

Why do we yawn? This question has not been definitively answered, but there is plenty of conjecture on the subject. It is assumed that yawning must serve some purpose or function, but what has not been agreed upon. In simplest terms, all humans yawn and most animals having vertebrates do also, but why is still… Read More »