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Quantum and classical physics from "summary" of The Magic of Reality by Richard Dawkins
Quantum physics is the branch of physics that deals with the behavior of very small things, like atoms and subatomic particles. Classical physics, on the other hand, deals with the behavior of larger things, like planets and baseballs. One of the key differences between the two is that classical physics is deterministic, meaning that if you know the starting conditions of a system, you can predict its future behavior with certainty. In contrast, quantum physics is probabilistic, meaning that you can only predict the likelihood of different outcomes. This probabilistic nature of quantum physics is a source of much confusion and mystery for many people, as it seems to go against our everyday experience of the world. In the classical world, things follow predictable, cause-and-effect patterns. In the quantum world, things can be in multiple states at once, and the act of observing a system can change its behavior. One of the most famous examples of this is the double-slit experiment, where particles like photons or electrons are fired at a barrier with two slits. In the classical world, we would ex...
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