Frank Capra stikes again! This is an interesting video. This used to be available free to schools through the old Bell System. It was listed as being for all audiences-and boy were they correct. Everyone from first graders to AARP types could learn something from this video and enjoy doing it. I have been showing this movie (now a video) for over 30 years and student get as much out of it today as they did 3- years ago. Why don't they make more science videos like this today!