Decade after decade scientists have continued to return to the double-slit experiment to help them answer questions about the quantum mechanics of reality - it continues to expose and untangle the deepest mysteries of the universe. Through Two Doors At Once celebrates physics at its most elegantly simple and profound. Ananthaswamy travels around the world and through history, introducing readers to visionary contemporary physicists such as Roger Penrose and Leonard Susskind who are still developing this experiment, as well as revolutionaries like Albert Einstein and Niels Bohr.