Estimations, Approximations and a Million Dollars

I’m loving this YouTube channel explaining cool and interesting scientific stuff : Minute Physics

I especially liked this video on how to weigh a million dollars with your mind. It struck a chord with me because it reminded me of how we sometimes come up with estimation for unknown future features or capabilities.

[youtube http://www.youtube.com/watch?v=-zexOIGlrFo?wmode=transparent]