Q: Why are the laws of quantum mechanics so strange? Does it mean that we’re missing something?
One of the most famous quotes about quantum physics, often used in lieu of a shrug, is due to St. Feynman: “If you think you understand quantum mechanics, you don’t understand quantum mechanics.” Which is fair, but it applies equally well to bicycle mechanics. The classical world (the world we experience) has one set of rules and the quantum world has another set of rules. The “correspondence principle” says that the quantum laws should, on a large and noisy enough scale, reproduce the classical laws. In other words, the very particular laws we consider “normal” are a special case of quantum laws. Chemistry and biochemistry are just applied quantum physics, so if you want to see some ridiculously fancy quantum physics at work, go no farther than your mirror.