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Sergey Ivanovich Vavilov inspects the ruins of an astronomical observatory in 1946
Sergey Ivanovich, the younger brother of the geneticist Nikolai Ivanovich, was a physicist and the founder of a school of physical optics. In 1945 he became President of the Academy of Sciences of the USSR and held the post until 1951. Nikolai Vavilov was arrested in 1940 on charges of