In Copenhagen, playwright Michael Frayn re-imagines the famous 1941 meeting of famed physicists Niels Bohr and Werner Heisenberg, which has been subject to much historical speculation. No one knows exactly what these two men – one a Nobel Prize-winner, the other, his esteemed mentor – discussed. What did Heisenberg believe could and should, be done about atomic bombs? What did he want from Bohr? The spirits of the two men and Bohr’s wife, Margrethe, meet after death to attempt to answer the original question: Why did Heisenberg come to Copenhagen? In this Underground Railway Theater production, their conversation addresses nuclear power and its control, the rationale behind building an atomic bomb, the uncertainty of the past and the inevitability of the future. Commemorating the 70th anniversary of the dropping of the atomic bomb, Eric Tucker (artistic director of last season’s Bedlam’s Saint Joan) cracks open Frayn’s contemporary classic on stage at Central Square Theater in Cambridge.