George Wald

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George Wald (November 18, 1906 – April 12, 1997) was an American scientist and activist who studied pigments in the retina. He won a share of the 1967 Nobel Prize in Physiology or Medicine with Haldan Keffer Hartline and Ragnar Granit. In 1970, Wald predicted that “civilization will end within 15 or 30 years unless immediate action is taken against problems facing mankind.”