The Problem With Falsifying Theories

F falsifying theories is not quite as straightforward as sometimes it's made out to be. Neutrinos were discovered because people noticed that energy apparently wasn't being conserved, and therefore some new process must be involved. Another example is relativity itself, where the notion of the principle of the conservation of energy can be expressed. And fortunately, there are conceptions of the law of conservation of energy which are compatible with general theory of relativity.