"\triangle x\;\triangle mv \ge \hbarThis we got from Heisenberg in 1927, but he blames it on Einstein. Heisenberg says, ....for more than three ...months they tried to describe the track of an electron across the , which they can see. They tried to describe it in quantum mechanics, and they couldn't ...These are the biggest shots in quantum mechanics, and they couldn't do it. Heisenberg, Bohr and Schrödinger... couldn't do it. ...[H]eisenberg said, then I remembered and suggested what Einstein had ...[said] earlier, "Theory must first say what can be observed" and when I looked at the problem from that side, I had the uncertainty relation."