Thanks for posting this. I’m a sucker for this kind of stuff, I’ve heard of the theory a bunch but reading the wikipedia article this morning had one of those Aha! moments when reading this “the eventual creation and annihilation of pairs that may occur now and then, is no creation nor annihilation, but only a change of directions of moving particles, from past to future, or from future to past.”

Never thought about it this way before but have had so much fun thinking about things in a new way since reading that. A new perspective on these sort of interactions, to think the energy produced by the annihilation is instead the energy required to reverse it’s direction in time. Thinking about it as the same particle has just given me a new way to picture these interactions.