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It was #3 on Hilbert's list of the most important problems in mathematics - until his student solved it.
More links & stuff in full description below ↓↓↓

Featuring Daniel Litt, currently at the Institute for Advanced Study - https://twitter.com/littmath

David Hilbert's problems: https://en.wikipedia.org/wiki/Hilbert%27s_problems

Max Dehn's famed proof: https://archive.org/details/mathematischean33behngoog/page/n488

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And support from Math For America - https://www.mathforamerica.org/

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