The top fighters spar hard. They're really sparring for two reasons: One is to improve their technique, but the other, which is just as important, is….

The brain stays up all night telling stories while we sleep. We just call them dreams..

We are, as a species, addicted to story. Even when the body goes to sleep, the mind stays up all night, telling itself stories..

Bull riding is probably the most dangerous sport in the world in terms of head injuries..