I don’t know anything about nuclear fission chain reactions, but I guess they’re not unlike dropping a ping-pong ball into an area where there are a lot of other ping-pong balls set on top of loaded mousetraps.

(If you’re not too interested in the set-up, skip to 1:45…)

Apparently, this is a somewhat common demo. Here are a bunch of other videos of ping pong balls and mousetraps. Yay, science.

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