Chemistry students at Horizon Science Academy in Cleveland had to illustrate a nuclear chain reaction and came up with this video. I wish nuclear chain reactions were always this fun.
First they tried green and yellow Skittles first - which is exactly what uranium-235 looks like when you get really close - but it wasn't good enough. That's why they got 300 mousetraps and 600 ping pong balls. They say they are going to make a bigger one soon. Let's hope they use a slow motion camera and better illumination for that one. [Thanks Karl!]