The Flexi Disc
I am old enough to remember Flexi Disc. I didn't think much of them because they were generally junk, but they are kind of a neat technology.
Technology
Early CGI
From 1982, Tomorrow's World takes a look at the beginning of computer generated images.
Inside an Arbra dynamite exploder. (With explosion and danger-cats.)
Boom! This is a fun video.
These cement-making bacteria could build the cities of the future
How a Character LCD works Part 1
Setting Fire to Glass – The “Nope” Chemical That is Chlorine Trifluoride
Super 8 Sound in 1977
Apparently editing a Super 8 video back in 1977 was quite a bit of work. Apparently with Super 8 film you can't just drag and drop around, and use the splice tool on your computer.