Very articulate!  Harvard is often very creative in their selection of commencement speakers.  When I was a grad student there, I inadvertently walked outside the fence around Harvard Yard and noticed a podium a few yards away.  At the podium Kermit the Frog was giving the undergraduate address, and I saw the late Jim Hensen working his puppet magic, crouched down behind the podium a fewr yards away.  I later learned that his daughter was graduating that day.  I will always treasure that surprise encounter with a magical speaker. 

 Jim, I remember hearing this before, and it is excellent.

thanks for sharing it.