http://video.google.com/videoplay?docid=-3674140982294628000 http://video.google.com/videoplay?docid=-3674140982294628000 "First of all it's not a science. It

http://video.google.com/videoplay?docid=-3674140982294628000 http://video.google.com/videoplay?docid=-3674140982294628000 "First of all it's not a science. It might be engineering or it might be art. ...has a lot in common with magic." So, who knows what it is exactly.