The explanation, if you get past the 2 minutes of the synchronized motorcycle-riding, is remarkably lucid and to the point. It starts from the most primary considerations and fully explains the concept. It is neither dumbed down nor laden with jargon. I wish more general-audience presentations today strived for the same. What more can you possibly want?

Perhaps the patience level of audiences of that era was much higher than today? But that's OK, now, thanks to modern media technology, you can randomly access any part of the presentation or speed it up at will.