Dan Buettner's iconic National Geographic cover story transformed our idea of what makes for a long, healthy life. It's now published online for the first time. OKINAWA, JAPANSquatting effortlessly on ...

The sea mammals may actually be able to sense the amount of oxygen in their blood—something we humans can't do. A new study suggests gray seals (Halichoerus grypus) can sense the level of oxygen in ...