Despite all those Ninja Turtles PSAs reminding us to shut off the water when brushing our teeth, most of us didn't listen — in fact, a large amount of all our faucet water goes directly down the drain. Smart Faucet ($40) is an easy way to help remedy the situation. It attaches directly to your existing faucet, and gives you a steady stream of water just by pressing on the lever, while getting rid of any drips or leaks. Green, economical, and sanitary, it's the next best thing to having a floor-operated faucet.