Trouser legs and nuclear reactor: what they have in common

1. Step 1. Trouser legs — is part of — Trousers. Two legs.
2. Step 2. Trousers — uses — Needle. Trousers were sewn with a needle.
3. Step 3. Needle — is part of — Syringe. A hollow needle.
4. Step 4. Syringe — is made of — Silver. Early needles were silver.
5. Step 5. Silver — is material for — Control rod. Control rods of pressurized water reactors are a silver–indium–cadmium alloy.
6. Step 6. Control rod — is part of — Nuclear reactor. The rods control the power.

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