10,000 Brilliant Ideas

Kids love to play in the sink. Mine do anyway. They enjoy a basin of water as much as the next kid, but they really want the tap on-full blast. Couldn't we invent a pump that keeps the water flowin without causing local droughts? If electric isn't feasible, perhaps using the pressure from the tap to circulate some water (albeit not at the same volume).

This is a bathtub that has the hot water circulate around a ceramic channel that's built into the tub (on the outside, but hidden) before spewing the water into the tub. That way your tub warms up as soon as you turn on the water.