Ever thought why don’t humans have tails? It certainly is one of the marathon questions that scientists themselves have been racking their brains about for years. Whereas most of the other species ...

WASHINGTON — Our very ancient animal ancestors had tails. Why don’t we? Somewhere around 20 million or 25 million years ago, when apes diverged from monkeys, our branch of the tree of life shed its ...

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

WASHINGTON (AP) — Our very ancient animal ancestors had tails. Why don’t we? Somewhere around 20 million or 25 million years ago, when apes diverged from monkeys, our branch of the tree of life shed ...

Humans have many wonderful qualities, but we lack something that’s a common feature among most animals with backbones: a tail. Exactly why that is has been something of a mystery. Tails are useful for ...

(CNN) -- Humans have many wonderful qualities, but we lack something that's a common feature among most animals with backbones: a tail. Exactly why that is has been something of a mystery. CNN — (CNN) ...