But for most mammals, they serve one major purpose: Balance. Yet, as you get closer to humans on the evolutionary tree, tails disappear. Gorillas don't have them. And neither do chimps or any ...

As a child, geneticist Bo Xia wondered why humans don't have tails. Years later, while recovering from a tailbone injury ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Humans have many ...

Humans do not have tails, but do we have “what it takes” for a tail? Hens don’t have teeth, but they have the genes for it. With atavism, it is as if our genomes serve as archives of our ...