MIT physics Professor Walter Lewin 
Very cool. "MIT professor and Web star Walter Lewin swings from pendulums and faces down wrecking balls to show students the zany beauty of science."
http://potw.news.yahoo.com/s/potw/63302/high-wire-act

Very cool. "MIT professor and Web star Walter Lewin swings from pendulums and faces down wrecking balls to show students the zany beauty of science."
http://potw.news.yahoo.com/s/potw/63302/high-wire-act