Sum of Natural Numbers (second proof and extra footage) - YouTube

http://www.youtube.com/watch?v=E-d9mgo8FGk&feature=youtu.be

MAIN VIDEO IS AT: http://youtu.be/w-I6XTVZXww More links & stuff in full description below ↓↓↓ Ed Copeland and Tony Padilla are physicists at the University ...