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"Of these four forces, there's one we don't really understand." "Is it the weak force or the strong--" "It's gravity."

"Fundamental Forces", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

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"Of these four forces, there's one we don't really understand." "Is it the weak force or the strong--" "It's gravity."


Page last modified: 2/20/2015.