Watch Mr. Wizard
Watch Mr. Wizard first aired on NBC on March 3, 1951. Mr. Wizard always had some kind of laboratory experiment going that taught something about science. The show was very successful. Mr. Wizard Science Clubs were started throughout North America, numbering 5000 by 1955 and 50,000 by 1965.I learned about Mr. Wizard from a friend of mine who became a college professor in chemistry. He said he learned more from Mr. Wizard than he did from school and that's what got him interested in science. A lot of the Mr. Wizard shows are on youtube. I embedded a few below, that I found.
There are probably many more of Mr. Wizard's episodes online.