Werner Heisenberg is suddenly in the news again, this time thanks to the award‐winning new play Copenhagen by Michael Frayn. The play centers on the ambiguous reasons for Heisenberg's visit in 1941 to his early mentor, Niels Bohr, in German‐occupied Copenhagen. It speculates on what might have transpired during the evening walk they took at that time, which Bohr ended abruptly, disturbed by something Heisenberg had said. (See David Cassidy's article on page 28.)

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