In this country, “dual flush” usually translates to flushing the toilet twice. But in response to federal laws mandating reduced water use, companies are starting to introduce the technology in the States. Caroma’s Profile Smart, for instance, ingeniously boosts the efficiency of the standard dual-flush model by integrating a sink. Water used for hand washing is siphoned into the toilet tank, where it remains until the next flush—tapping a resource that would ordinarily go down the drain. For more info, go here.