When I was a tot we were shown several films in a series based on scientific topics. There was one about the Sun, one about the circulatory system a several others. They were in color and they all featured two guys, one a young reporter guy and the other an older bald guy who seemed to know everything about science. The thing that set them apart was they would show several other films during the course of the film they were in. One guy would always pick up a microphone of some kind and say “roll 17” or some other number and then a film would start playing.
Does anyone remember what these movies were called?