Instruct: Classify Amazon reviews into positive or negative sentiment
Query: I expected More...

I was expecting some real insight into the nature and meaning of 'believe' and 'prove' but it seemed to me that none of the luminaries answering the question had given it much thought. Today's "leading thinkers on Science" mostly provided rather short articles and most said they believed that there was life elsewhere in the universe but that they couldn't prove it.I was hoping for some substantive discussion of topics from the leading edges of science and philosophy such as Darwinian evolution vs intelligent design or the propects for the cloning of a human being. Or how about this: I believe that I exist but, on reflection, I realize that I can't prove it. Or, I believe I have free will but I can't prove it. Or I believe UFOs are piloted by non-human intelligent beings but I can't prove it.