[osteele]

Related: U.S. President James Garfield constructed an original proof of the Pythagorean Theorem.

https://www.maa.org/press/periodicals/convergence/mathematic...

https://blogs.scientificamerican.com/observations/presidenti...

[MrMorden]

Herbert Hoover (and Lou Hoover)'s translation of De Re Metallica is still both useful and in print a century later.

http://store.doverpublications.com/0486600068.html