Not everyone in the world has access to clean water. Ashok Gadgil's UV Waterworks can purify water quickly and cheaply using ultraviolet light. His invention has helped prevent disease in his native India and throughout the developing world, where clean water is a luxury.

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"Prototype Online: Inventive Voices" is a production of the Smithsonian's Lemelson Center. Written and hosted by Paul Rosenthal. Audio production by Benjamin Bloom. Theme music by Will Eastman. Art Molella, executive producer. Ashok Gadgil was originally interviewed on 28 August 1998 by Michael Judd, former Lemelson Center educator, with a further interview conducted by the Lemelson Center in May 2006; podcast released 22 May 2006.