mkyou2tube is dedicated to the mission of suggesting that not all mathematicians are deserving of their geeky stereotype.

Galois, for example, died in a duel, allegedly over the affections of a lady.

he is most famous for group theory, which ultimately led to the discovery that there aren't any formulae for solving equations where x is raised to the fifth power or higher. Most of us are aware of the quadratic formula, and there exist versions for cubics and quartics, but that's as far as it goes.

If it doesn't sound like he did very much, it should be noted that he did die at the age of twenty.
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30th May, 2012, is the 180th anniversary of Galois' death, but he's not famous for any exploits with triangles