[narrating] In 6500 BC, some guy looked at his friend and said, let's drill a hole in your head... that will make you feel better. And thus surgery was born. It takes a certain brand of crazy to think of drilling into someone's skull, but surgeons have always been a confident bunch. We don't always know what we're doing, but we act like we do. We walk into a country, plant a flag and start ordering people around. It's invigorating and terrifying.

Meredith