Neil Tyson talks about UFOs and the argument from ignorance.

youtube.com — Link for full video:Cosmic Quandaries with Dr. Neil deGrasse Tyson -http://www.youtube.com/watch?v=CAD25s53wmEhttp://en.wikipedia.org/wiki/Argument_from_ignoranceThe argument from ignorance, also known as argumentum ad ignorantiam ("appeal to ignorance" , argument by lack of imagination, or negative evidence, is a logical fallacy in wh... Sep 14, 2009 View in Crawl 4