Chris Hadfield is back with another transmission from low Earth orbit. This time he’s demonstrating one of the most common daily tasks: brushing your teeth. Normally you would just flip on the faucet, wet your brush, and get to work. In space however, flowing water would actually be dangerous. Hadfield has to muster a ball of water from a package to soak his brush, and worst of all, he has to swallow the toothpaste.