What's cooler than exhaling cigarette smoke and sucking it directly into your nose? Blowing air bubbles out of your nostrils and sniffing them back in so you can smell things underwater. That's just what the star-nosed mole [above] and the water shrew do to track the scent of worms while submerged, according to a report in this week's Nature. And here most of us thought the technique was only good for making gross snot bubbles.