Chain reaction and joystick: what they have in common

1. Step 1. Chain reaction — is used in — Control rod. It absorbs neutrons, holding back the chain reaction.
2. Step 2. Control rod — is made of — Silver. Control rods of pressurized water reactors are a silver–indium–cadmium alloy.
3. Step 3. Silver — uses — Electrical conduction. The best conductor.
4. Step 4. Electrical conduction — is used in — Electrical resistance. Resistance is a property of a conductor.
5. Step 5. Electrical resistance — is used in — Potentiometer. A voltage divider.
6. Step 6. Potentiometer — is used in — Joystick. Position is read with potentiometers.

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