Yahoo! News - ET Visitors: Scientists See High Likelihood: "Now a team of American scientists note that recent astrophysical discoveries suggest that we should find ourselves in the midst of one or more extraterrestrial civilizations. Moreover, they argue it is a mistake to reject all UFO reports since some evidence for the theoretically-predicted extraterrestrial visitors might just be found there."
This whole article is worth reading. I confess that I know less than nothing about wormholes and superstring theory, but I do think the possibility of extraterrestrial life is fascinating to contemplate.