Paul Langevin
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English: Paul Langevin (January 23, 1872 – December 19, 1946) was a French physicist.
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Albert Einstein, Paul Ehrenfest, Paul Langevin, Heike Kamerlingh Onnes, and Pierre Weiss at Onnes' home in Leiden.
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First Solvay Conference on Physics, Brussels, 1911.
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Third Solvay Conference on Physics, Brussels, 1921.
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Fifth Solvay Conference on Physics, Brussels, 1927.
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Seventh Solvay Conference on Physics, Brussels, 1933.