So don’t try to prove things; try to convince yourself. And be your own harshest critic and your own greatest skeptic. Every scientific theory will someday fail, and when it does, that will herald a new era of scientific inquiry and discovery. And of all the scientific theories we’ve ever come up with, the best ones succeed for the longest amounts of time and over the greatest ranges possible. In some sense, it’s better than a proof: it’s the most correct description of the physical world humanity has ever imagined.