Since then it has evolved into a global crisis.

Salsa is a kind of dancing that evolved in the mid-1970s in New York.

LOL has evolved into something much subtler and sophisticated and is used even when nothing is remotely amusing.

As a zoologist focusing on the studies of apes and monkeys, I've been studying why humans evolved to become the naked ape and why skin comes in so many different shades around the world.

Flamingos have evolved very leathery skin on their legs so they can tolerate the salt water, says David Harper, a professor at the University of Leicester.

We can make a very good estimate from the fossil record that humans probably evolved naked skin around a million and a half years ago and meanwhile they mostly lost their coat of fur.