Neil deGrasse Tyson "Search For Life in the Universe"

The discovery of about half a dozen planets around stars other than the Sun has triggered tremendous public interest. Attention was driven not so much by the discovery of extra-solar planets, but by the prospect of them hosting intelligent life. In any case, the media frenzy that followed was somewhat out of proportion with the events. Why? Because planets cannot be all that rare in the universe if the Sun happens to have a bunch of them. Even if they were teeming with buoyant aliens, the odds against these life forms being intelligent may be astronomical.