How do control rods in nuclear reactors work?
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Nuclear reactors are basically big sticks of bags of bouncy balls. If you hit a bag of bouncy balls with another ball, the bag splits open… And balls bounce everywhere.
Balls flying everywhere makes things hot.
Control rods are sticky, and bouncy balls stick to them.
What you want is enough sticks to stick balls to that all the bags of balls don’t split really really fast.
If you want to turn the reactor off, you put in more control rods. They catch all the balls, and stop more bags of balls from splitting.
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