Found it curious how the same person have two different approaches to the question of the unknown, as with....<br>Lex: "Where do you fall, your own estimate, your own guess on this question: are we alone in the universe do you think?"<br>Answer: "I think it would be foolish to give any firm estimate because we just don't know..."<br><br>Yet, the same person a few minutes latter:<br>"...the fact that we have new constraints on what dark matter could be, doesn't diminish my belief that it's there..."<br>Not criticizing the guy (loved the interview and he is clearly as smart as it gets), but I really find it interesting how some people in the cientific field avoid speculating about the question:  "are we alone".,(reply>), Perhaps they sometimes feel compelled to give an answer to questions like these, inquiring for a prediction, as opposed to simply always answering "I can't give a definitive answer to that"