We often think of mathematics as being clean-cut, with questions being settled with theorems, and not much room for disagreement. This isn't true though of course.
Going back to ancient history, we hear the story of how Pythagoras murdered the man that discovered irrational numbers. Jumping to modern mathematics, Cantor's ideas about infinity invoked such harsh criticism, he literally went insane$^1$.
Is there a good website or other resource recounting some of the great controversies and debates of mathematics?
$^{^{^1\text{Although I'm sure going insane isn't fun, you have to admit that's a pretty awesome reason, if one had the choice.}}}$