Lightning rod spike and syringe: what they have in common

1. Step 1. Lightning rod spike — is part of — Lightning rod. A rod above the roof.
2. Step 2. Lightning rod — uses — Electrical conduction. It carries the current into the ground.
3. Step 3. Electrical conduction — is used in — Silver. The best conductor.
4. Step 4. Silver — is material for — Syringe. Early needles were silver.

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