An interview:
Critics of string theory have called it unscientific because it is not falsifiable. How can we evaluate string theory?
Falsifiability for a theory is great, but a theory can still be respectable even if it is not falsifiable, as long as it is verifiable. There are aspects of a theory that you can go out and look for and confirm, and that’s another way to gain confidence in it. For instance, it’s really hard to falsify the statement that there is life on another planet, but you can verify it by finding one example. We’re hoping that certain features of string theory are confirmable.
