4 ms·

This one? http://youtu.be/0zHev9iM8kU?t=20m26s http://youtu.be/0zHev9iM8kU?t=20m26s

• pdkl95 12y ago
  That's part of it, thanks! (the instructor might have pieced together footage from a few videos. The glass tube+stopper scene is definitely the one I was remembering)