We have always had a great deal of difficulty
understanding the world view
that quantum mechanics represents.
At least I do,
because I’m an old enough man
that I haven't got to the point
that this stuff is obvious to me.
Okay, I still get nervous with it…
You know how it always is,
every new idea,
it takes a generation or two
until it becomes obvious
that there’s no real problem.
I cannot define the real problem,
therefore I suspect there’s no real problem,
but I’m not sure
there’s no real problem.

-Richard Feynman, set in verse by David Mermin