It says that: I think I can safely say that nobody understands quantum mechanics....Do not keep saysing to yourself, if you can possibly avoid it. But how can it be like that? Because you will go "down the drain" into a blind alley from which nobody has yet escaped. Nobody knows how it can be like that. by Richard Feynman what does he mean by "down to the drain" and "blind alley"? . . why is quantum world so confusing? can anyone just come up with an example would be great cheers..