Physics philosopher David Z Albert talks to cosmologist Sean M. Carroll in this 2008 Bloggingheads interview. They defend string theory as legitimate science, even tho they concede that a particle accelerator the size of the galaxy might be unable to test the theory. That is, there is no conceivable observation that would be contrary to the theory.
Nevertheless Albert argues that gravitation is a "spectactular predictive success of string theory."
This is nonsense, of course. If string theory said anything about gravity, then it would be testable. Gravitation is well understood, but there are some anomalies such as dark matter and dark energy. String theory does not resolve these, as one would expect if it really predicted gravity. String theory does not predict gravity.
The only connection between string theory and gravity is that string theory predicts a spin-2 particle, and gravity waves have characteristics of a spin-2 field. But gravity waves have never been observed, and there is no hope of observing those spin-2 gravitons. Also, string theory models are usually assumed to be Ricci-flat, as general relativity requires of empty space.
A recent SciAm article claimed that unitarity and supersymmetric gravity could be used to show that a spin-2 graviton resembles two spin-1 gluons, ressurecting ideas that had been abandoned in the 1980s as unworkable. There are fewer divergences that previous thought, the article says. But there are still infinities that prevent predictions.
They go on to discuss the arrow of time. But there are no testable ideas there either.
Albert also discusses being sucked into the 2004 movie What the Bleep Do We Know!?. He claims that his views were misrepresented. The movie is New Age drivel about quantum consciousness. Of course his ideas were misrepresented. They always are. Physicists themselves cannot express themselves coherently on this subject. Philosophers never say that their views are accurately represented. I have listened to him for a couple of hours, and I still don't think that I could summarize his views in a way that he would accept.
Albert said that physicist Eugene Wigner once said that a dog could make a quantum observation, but not a rat, because dogs are more conscious. Wigner was brilliant and one of the creators of quantum mechanics. If physicists say stuff like this, then they should not be surprised that New Age hippies go further.
Albert previously trashed Krauss's book on nothing, and so Krauss badmouthed all philosophers. Albert was supposed to be one of those philosophers who actually understands physics. They both understand physics but they also say some wacky things.