The Elegant Universe

Nova had a great program on String Theory. (The PBS program can be viewed online) When I studied particle physics, String Theory was still not that popular. It seems like with the advent of M-Theory (which unified the 5 possible string theories), it has caught on much more and Field theories have fallen by the wayside. Never let it be said that physics is not capable of great change. It is a little disturbing that all of this can basically not be tested currently and that the scale of experiment needed to test these theories is going to be very expensive! But I'm for any theory that claims that we're all living in a loaf of bread!