Appropriate technology (AT) is technology that is designed with special consideration to the context of its use - including environmental, ethical, cultural, social, political, and economical aspects of the community it is intended for. http://www.appropedia.org
In the summer of 2011, students studied appropriate technology and Spanish while working with community members of La Yuca to build a schoolroom from plastic bottles and concrete, lit with solar and homemade wind power from bike parts and newspaper press waste, that catches its own rainwater for cleaning and drinking.
Pot in pot refrigerator In 2001, Nigerian Mohammed Bah Abba won the 2001 Rolex Awards for Enterprise with his invention of a simple cooling system to preserve food in rural areas with no electricity. His solution was a Pot-in-Pot refrigerator, which relies on the concept of evaporative cooling. The system works by putting a smaller clay pot inside a larger one, separating the two by constantly moist sand. Evaporation causes a cooling effect in the inner pot.