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30/01/1991 American physicist and electrical engineer John Bardeen dies

He is noted for invention of the transistor with William Shockley and Walter Brattain and for a fundamental theory of conventional superconductivity, known as the BCS theory, with Leon N Cooper and John Robert Schrieffer. Both these achievements were rewarded by Nobel Prize in physics, making John Bardeen only one person who won it twice.


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