When he proposed his uncertainty principal, Heisenberg was working with Bohr at the university of Copenhagen. The two scientists had widely different views about the significance of the uncertainty principal and the idea that particles could behave as waves. To Heisenberg, uncertainty was a fundamental characteristic of nature. To Bohr, it was merely a mathematical consequence of the wave-particle duality of electrons; an electron's position and path had no physical meaning. The debate between the two gifted scientists was heated at times. Heisenberg later wrote about one particularly emotional debate: At the end of the discussion I went alone for a walk in the neighboring park and repeated to myself again and again the question: "can nature possibly be as absurd as it seems...?" When I read this in my chemistry book I knew I just had to make this