Dean Kamen has unveiled the latest iteration of his power and water package for the third world. The two components are a water purifier called Slingshot that uses a fraction of the power of alternatives and a Stirling engine based power generator that works on cow dung. The $1500 water purifier will produce 1000 liters of water a day, while the $3,700 generator produces around 1 kW, which is enough to deliver light to a small village. The two products have been in development for years, but it looks as though they are now ready for more prime time consideration.