“The Schrödinger equation, then, is an expression for finding out how an abstract entity called a wavefunction is distributed in space and how it evolves in time. And – here’s the really important thing – this wavefunction contains all the information one can possibly access about the corresponding quantum particle. Once you have the particle’s wavefunction, you can extract that information by doing something to it. For example, you can square it to find out the probability of finding the particle at any location in space.”