Imagine uranium like a bunch of mousetraps with ping pong balls on them. The ping pong ball is like a neutron. If you fire a ping pong ball at one of the mouse traps, it’ll cause a chain reaction launching the other ping pong balls.
Imagine the mouse traps reload automatically, so without intervention the reaction will continue until something intervenes.
The carbon rods would be like lowering dividers between the mousetraps so the balls in motion will get deflected and stop triggering the other mousetraps.
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