Heisenberg Uncertainty Principle Explained (Man Who Wasn't There)

"I believe that the existence of the classical 'path' can be pregnantly formulated as follows: The 'path' comes into existence only when we observe it." (Heisenberg, in uncertainty principle paper, 1927)

"In the sharp formulation of the law of causality - 'if we know the present exactly, we can calculate the future' - it is not the conclusion that is wrong but the premise." (Heisenberg, in uncertainty principle paper, 1927)