When I came across the video, I watched it again, and all of the emotions of the day that I showed it to my class came flooding back.  It is not that it was an astounding video, but it was the last video that I made for my students prior to leaving Chicago.  This was especially hard for me as many of the students had been in my class for the past two years.  I had taught them chemistry, then challenged them to take ap chem.  A recent facebook connection with a prior student motivated me to post the video, in the hopes that I could reconnect with as many of the original class members are possible.