The PSSC works are simly unique. Precious pieces of knowledge and culture they remain unmatched to this day. Thanks ever so much for taking the time to digitalise and make available these classic videos. Excellent GuiAero 2008-10-11 22:24:45 2008-10-11 22:24:45 5 Thanks for making this classic video available! I use it every semester in my physics classes at a community college in California. I'm working on producing a version with DVD chapter marks, and possibly closed captions (which we're under legal pressure to include on all audiovisual materials). thanks! bcrowell 2009-05-16 01:47:17 2009-05-16 01:47:17 5 2 5.00