After watching the first two hours of the program (which are available online in quicktime format for those of you who have not watched it yet), it seems that many of the scientists involved in string theory realize that this is an untestable theory.
If that is so, then are these scientists now playing more of the philosopher role than the scientist role? There is obviously a lot of work being done on the mathematics, but ultimately if the theory cannot be proven correct or incorrect, then do we say that science must look elsewhere *OR* might we conclude that we have reached the end of science in that particular field (unraveling the micro-scale to the fullest)?
Also, if the universe is composed of nothing but energetic strings vibrating in different ways through 11 dimensions, what exactly is "space" and are there "space messenger particles" that compose the fabric of space and time?
Is there something still smaller than the strings? If there is, could it be possible that we're looking down and seeing an infinite amount of turtles on each other's backs?