A few weeks ago, Professor Ben Zuckerman spoke at my school. He is one of the editors of the popular book "Extraterrestrials: Where Are They?" which explores in part the Fermi paradox: Why haven't extra-terrestrials tried to contact us yet? While he gave two lectures, I only attended one, where he went over many of the ideas in his book, explaining the rarity of technological life and the improbability of us ever making "contact".
I went to the colloquium talk rather interested. In honesty, I kind of misunderstood the intention of the talk (I thought he was going to be arguing against the existence of extraterrestrial life), but I was not disappointed. There were a lot of interesting ideas brought up about how to make contact or about what sorts of development projects we should pursue. And while I think some of them were really bad, they were thought-provoking. (Dr. Zuckerman of course recognizes the flaws of these, saying they are just stage 1 prototype designs).
The talk was very well done and I won't touch on it too much. What I really wanted to address was an audience question asked by one of the professors at my university. First let me provide some background.