It wastes water, costs money, is illegal in a growing number of cities, and looks really, really dumb! You've driven down the street and seen it - water pouring out of the sky, running down the street, puddling on sidewalks - and there is your neighbor's sprinkler system, working its little heart out, pumping even more liquid onto the grass. Ah, yet another gift of modern technology. Back when we laid out the hose and stood there with a spray nozzle in our hand or screwed on a spinning sprinkler...