"It could be zero." The same anthropocentrism that humans have suffered from for millennia. As smart as our best physicists are, they've barely scratched the surface. The reality is that we're probably surrounded by intelligent life, but just don't have the capabilities [yet] to identify it...anymore than Galileo was aware of the theory of relativity.<br><br>Am I the only one who finds it more than a little ironic that sitting on the table in front of Brian Greene is a water bottle with text printed on it that, when spelled backwards, says "naive.",(reply>), Msg direct watsap~~~~~~~