PBS
Pbs Learning Media: Inexpensive Inventions and the World's Poor: Earth Sky
Environmental scientist Ashok Gadgil is perhaps best known for his inventions which include an ultraviolet water purifier that can provide clean, cheap water for a thousand people per day and an inexpensive, ultra-efficient cooking stove...
NPR: National Public Radio
Npr: Biosphere 2
Audio story presents information on the Biosphere 2 project, an attempt to replicate the world's biospheres in a controlled environment. Includes a map of the facility.
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