Stop for a moment and recall your fondest childhood memory. Or your worst. In either case, there's a really good chance that it's total bullshit.
Memory is a funny thing. Research has consistently found that our memories from when we were kids are either extremely inaccurate, or didn't happen at all. They are just elaborate constructions of a memory storage system that isn't very good at distinguishing real memories from fake ones.

So what if we told you that there was a way to do this on purpose? To hack your brain into believing (and "seeing" vividly) a completely made-up event that never actually happened?