Let there be light! I love to hear of simple solutions to long-term problems. In many parts of the world the sun shines intensely but inside the homes of millions of poor people it remains dark even during the light of day.
The URL below is to a short video that shows a great solution to that problem using little more than a cast off soda bottle filled with water, a little chlorine, the sun, and very basic hand tools, to quickly, cheaply, and simply create the same amount of light as a 55-Watt electic bulb without using electricity!
Russ Towne's A Grateful Man 