"When you dip a glass in the ocean and you look at it and your glass has no fish, what’s your conclusion? Is your conclusion that the ocean doesn’t have any fish in it or is your conclusion, “that’s and awfully big ocean and I didn’t sample very much of it with my glass”? 50 years of exploration of the cosmic oceans is miniscule. We haven’t looked yet. We’ve hardly begun to search. We ought to do a much better job of searching before we draw any extraordinary conclusions."