http://gizmodo.com/5678522/watch-the-worlds-coolest-math-teacher-troubleshoot-a-haunted-pc[youtube]http://www.youtube.com/watch?v=04jsncsgrjo&feature=player_embedded[/youtube]
[youtube]http://www.youtube.com/watch?v=blOrY-nEGaE&feature=player_embedded[/youtube]
[youtube]http://www.youtube.com/watch?v=XKviYiZhtZY&feature=player_embedded[/youtube]