The document discusses the history of the discovery of the positron particle through Paul Dirac's equation and experiments by Carl Anderson. It then describes how Feynman diagrams can depict particle interactions over space and time, including electron-positron annihilation. The document proposes the idea of "positronic variables" in software that can change values as they propagate backwards in time. This leads to a discussion of how a multi-state or multiverse model is needed to make sense of variables changing value retroactively.