Most people catch the common cold at least once a year, making the seasonal sniffles a staple of the human experience. But when in Homo sapiens' history did people first start catching the common ...

Multiple ice rescues of humans and animals over the last few days have prompted warnings from officials about ice safety.

In other words, in the case of the cold, they can infect only humans. How it works is that a virus is like a key that only fits into the right lock, called a receptor. It must bind to that ...