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Sir Cyril Norman Hinshelwood was 59 years old when he won the Nobel Prize in Chemistry in 1956. He shared the prize with Nikolai Nikolaevich Semenov for their work on the mechanism of chemical reactions. Hinshelwood was born in London, England, in 1897. He studied chemistry at the University of London and earned his Ph.D. in 1920. He then worked as a research chemist at the University of Oxford.