Alfredo Moser had a bright idea. Inspired by persistent troubles with electricity in his area, he began experimenting with water-filled plastic bottles as a means of bringing light indoors during the day. After some tweaks, a little bleach, and a few holes in the roof, the "Moser lamp" was invented. Today, hundreds of thousands of homes in the developing world have homemade Moser lamps installed, and benefit from the safe, low-cost, sustainable lights.

But Moser hasn't made much of anything off of the globalization of his concept. Nor does he want to. He still lives in a simple house and drives a 1974 car. Moser says, "There was one man who installed the lights and within a month he had saved enough to pay for the essential things for his child, who was about to be born. Can you imagine?"

For Moser, the joy of seeing others use his design outweighs the possibility for personal profit. "It's a divine light," he says. "God gave the sun to everyone, and light is for everyone. Whoever wants it saves money. You can't get an electric shock from it, and it doesn't cost a penny."

Possible Preaching Angle:

Freely he has received, freely he gave.