Louis J. Sheehan.  A garden hose, a tin can, duct tape, metal piping, kitchen cleaner, and gasoline: That is all television icon MacGyver needed to make a flame-thrower to ward off a swarm of killer ants. In the real world, technologies that are affordable and practical are not so simple to create, but they can make a huge impact on people's lives. Instead of calling on complex solutions (reliant on engines and imported resources) for low-tech problems (such as cooking and