In Japan, however, technologists have been hard at work in every room of the home, including the bathroom, where smart toilets are now in use in a full 70 percent of households. What's a smart toilet? Think of a high-tech commode featuring a lid that opens automatically when you approach it, as well as a heated seat, a music player, automatic flushing capability, and bidet features that give your undercarriage a gentle (and warm) spray-down when you're done. Smart toilets even have a green angle: They can cut toilet paper use by up to 90 percent, according to manufacturer Toto.