Lundborg: Is string theory still the best game in town?
Weinberg: It's the best game in town, but it may not be the right game.
Lundborg: You're disappointed that it hasn't actually led anywhere?
Weinberg: Since the 1980s string theory has not come up with a prediction of anything new that we could then verify in the laboratory in a way that could convince us that string theory is right.
Although there may be one fundamental string theory, it has many, many solutions. And finding the one that describes our world may be impossibly hard.