Neutron initiator and laser: what they have in common

1. Step 1. Neutron initiator — is part of — Nuclear weapon. It starts the chain reaction.
2. Step 2. Nuclear weapon — works like — Nuclear reactor. The same physics: a controlled and an uncontrolled chain reaction.
3. Step 3. Nuclear reactor — has part — Control rod. The rods control the power.
4. Step 4. Control rod — is made of — Silver. Control rods of pressurized water reactors are a silver–indium–cadmium alloy.
5. Step 5. Silver — is material for — Mirror. A silver coating.
6. Step 6. Mirror — is part of — Laser. A resonator made of mirrors.

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