How do rods control the nuclear fission reaction?

Related questions

1. Why do control rods absorb neutrons?
2. How long do nuclear fuel rods last?
3. Is Hiroshima worth a day trip?
4. How does a RBMK reactor work?
5. How are control rods used in an emergency?
6. What happens when control rods are lowered into the reactor?
7. What happens if control rods are removed?
8. Why nuclear energy is dangerous?
9. What went wrong in the Chernobyl power plant 1986?
10. What do control rods do?

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