Ashok Gadgil

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Ashok Gadgil is a Berkeley, California based scientist who invented the now widely-used UV-disinfection method for ridding drinking water of cholera and other harmful infectious agents for pennies per ton, thus making safer drinking water available cheaply for millions, especially in third-world countries.

Gadgil has also made waves recently with his invention of a process that uses coal ash in order to remove arsenic from water supplies, also for a tiny fraction of the cost of other methods.