Mysteries of the Unknown

Commercials for Time-Life’s “Mysteries of the Unknown” book series used to be on all the time when I was a kid back in the 80s. I never actually read any of the books, but the commercials were effective in making you think about interesting ideas, even if some of the things in them were just fantasy. There are a number of these commercials on YouTube, including a large compilation video. Here is a classic example: