Lightning rod and rock drill: what they have in common

1. Step 1. Lightning rod — uses — Electrical conduction. It carries the current into the ground.
2. Step 2. Electrical conduction — is used in — Silver. The best conductor.
3. Step 3. Silver — is material for — Syringe. Early needles were silver.
4. Step 4. Syringe — has part — Piston. A plunger.
5. Step 5. Piston — is part of — Rock drill. A percussion piston.

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