Tadashi at Stanford - https://mathematics.stanford.edu/people/tadashi-tokieda
Tadashi videos on Numberphile - https://www.youtube.com/playlist?list=PLt5AfwLFPxWI9eDSJREzp1wvOJsjt23H_
Lev Davidovich Landau - https://en.wikipedia.org/wiki/Lev_Landau
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