Harvard Professor: 90 seconds you won't regret seeing!

Now here   is something that absolutely everyone should see!

  This could be used in so many ways, in so
  many places ... it is stunningly simple, and so totally profound ...!

  Note that at the bottom of the clip it gives permission to use this clip
  provided it is not altered. Harvard Professor: 90 seconds you won't regret

   http://www.youtube.com/watch_popup?v=YjntXYDPw44&sns=em