Wikipedia, of all places, has a decent entry on the double-slit experiment. Perhaps the section on hydrodynamics is more achievable than the math!

I like the idea of plot rot. I've encountered it often in both reading and in life.

What I was trying to say was that "three can keep a secret, if two of them are dead."   Ol' Ben Franklin said that. Of course, if the remaining person spills the secret then no one can keep one.

Sometimes what is known weighs so heavily that a secret must be told to others or simply committed to paper and the paper burned.