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https://xkcd.com/2943/
xkcd: Unsolved Chemistry Problems
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https://www.livescience.com/38936-mathematics.html
Mathematics: Facts about counting, equations, and infamous unsolved problems | Live Science
Discover interesting facts about mathematics, who invented it and the most famous unsolved problems.
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https://www.aeaweb.org/articles?id=10.1257/jep.1.1.121
Choice under Uncertainty: Problems Solved and Unsolved - American Economic Association
Choice under Uncertainty: Problems Solved and Unsolved by Mark J. Machina. Published in volume 1, issue 1, pages 121-154 of Journal of Economic Perspectives,...
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https://xkcd.com/3115/
xkcd: Unsolved Physics Problems
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