Too Long; Didn't Read
Ever heard of <a href="https://en.wikipedia.org/wiki/Schr%C3%B6dinger%27s_cat" target="_blank">Schroedinger’s cat</a>? It’s a thought experiment that poses if a cat is in a box, it can be simultaneously dead and alive because we don’t know unless we can see it. In other words, its status is affected by whether we can observe it or not. Or if you prefer a more fun definition, here are the loveable geeks from HBO’s TV series Silicon Valley explaining it (apologies for the poor quality):