P vs. NP Problem Linked To the Quantum Nature of the Universe

There are some experiments where it’s easy to see quantum effects in “big” things. I’m sure that there are experiments that show explicitly the wave behavior of helium atoms (they have like 2 electrons and 12 quarks, they are not a single particle) http://en.wikipedia.org/wiki/Helium_atom_scattering . I think there are bigger examples, but I should google a little to find them.

Also, the superconductivity and superfluity effects are due to quantum mechanics effects (a lot of properties of solids only can be explained correctly using quantum mechanics, but they are not so evident).

There is more hand waving that a proof here. Obligatory Xkcd: http://xkcd.com/1240/