Whatever the tools we use, as we focus on reality at the quantum level, we must make certain choices. We can zoom in on an electron’s position or on its momentum. We can further define the energy of an event or its time. But in each case, the more we focus on one factor, the greater the uncertainty of the other. And the value lodged in the pivot between one side and the other of his equation was nothing other than our old friend Planck’s constant.
