Among more than 5,000 kinds of mammals, only human bodies are obviously hairless, very different from other animals. Imagine this: what if you shaved off all the fur from your pet dog or cat (or even think about a polar bear)? How would they look? How would they feel to the touch? Scientists have provided three important explanations regarding why humans do not have fur. All these explanations revolve around one concept: despite humans sharing a common ancestor with our closest living relatives, chimpanzees, 6 million years ago, having less body hair has been beneficial for our lineage's evolution. The Aquatic Ape Hypothesis suggests that 6 or 8 million years ago, the ancestors of modern humans...