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Explain quantum mechanics in 5 words or less.
"Don’t look : waves.
Look : particles."
(an answer to a challenge asked by Sean Carroll on Twitter, originally posed by physicist John Wheeler)
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There is a lot to say about quantum mechanics, perhaps the most mysterious idea ever to be contemplated by human beings, but all we need is one simple (but hard to accept) fact:
How the world appears when we look at it is very different from how it really is.
—Sean Carroll
The Particle at the End of the Universe - The Hunt for the Higgs and the Discovery of a New World
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