The 1927 Solvay conference was perhaps the most important in the history of quantum theory. Contrary to popular belief, questions of interpretation were not settled at this conference. Instead, a range of sharply conflicting views were extensively discussed, including de Broglie s pilot-wave theory (which de Broglie presented for a many-body system), Born and Heisenberg s quantum mechanics (which apparently lacked wave function collapse or fundamental time evolution), and Schrodinger s wave mechanics. Today, there is no longer a dominant interpretation of quantum theory, so it is important to...