Disney produced a documentary promoting nuclear power in 1957 called Our Friend the Atom. It has been shown in countless high school science classes since then. The 53-minute film is available in segments on YouTube, if you’d like to watch the whole thing. One part that stuck with us is the demonstration of a chain reaction using ping pong balls on mousetraps. After seeing it, many budding scientists worked to recreate it. Not because it was educational, but because it was so cool. See seven of those experiments in a video collection I posted at mental_floss.