My sister sent me this case study on a new(ish), and incredibly simple technology, that was devised in South Africa in the late 90s when some engineers found a way to pump clean water reserves using roundabouts (merry-go-rounds) that kids play on as the engines. So play time = clean water. Genius! + Article on Roundabout Outdoor Play Pump + Play Pumps Official Site - Includes information on helping to sponsor play pumps where they are most needed + National Geographic Kids - play pump news story and video