Robert Buettner quotes:

Absence of proof isn't proof of absence.

The only animal capable of giving man a fair fight is man. Actually, among ourselves, we fight unfairest of all, and the more we practice, the nastier we get.

Since the war, we're the only intelligent species left in the universe, therefore we think everything in this universe has to conform to our paradigm of what makes sense. Do you have any idea how arrogant that view is and on how little of this universe we base it?