http://www.youtube.com/watch?v=uaNZOgCno_8

I always get a great kick out of Alex at Towson (Yes a Doctor/professor at Towson) because he ‘seems’ to be laid back (well actually, he sort of is), and he NEVER wears a suit (I’ve never seen him dressed other than the way he is in the video)............he is still, in my mind a hippie but one of the best sources of information when it comes to astronomy and astrophysics.  This is his 2-minute lecture on the math behind the physics that conclude ‘Why there are probably no UFOs’