Teach me something interesting using the expanding brain meme https://imgflip.com/memegenerator/Expanding-Brain …https://twitter.com/vgr/status/1008029524393508864 …
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A redefinition of the concept of "solid", or "taking up space". Fermions "take up space" because of the Pauli exclusion principle, which gives rise to a physical resistive force when you try to to push two fermion systems into each other.
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