bbc.co.uk: "In this one-off documentary, David Malone looks at four brilliant mathematicians - Georg Cantor, Ludwig Boltzmann, Kurt Gödel and Alan Turing - whose genius has profoundly affected us, but which tragically drove them insane and eventually led to them all committing suicide." Watch here
If you liked this documentary, have a look at Logicomix. There is a nice German review of Logicomix at nerdcore .
