Freeplay Energy made a splash a few years ago marketing its windup radio. It now has a number of products. One is a clamp mounted device that can be plugged into a OLPC XO (One Laptop Per Child) computer to power the device for a kid who does not enjoy being wired into a source of electric power. It now also has a number of lighting devices, which combine the windup energy source with fiber optics. The Freeplay Foundation, an organization separated from Freeplay Energy by a firewall, seeks to support the use of the Freeplay radio for development purposes.
This is an example of fairly high tech in a simple. low-cost format, solving problems in serving poor people in developing countries.
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