Tweezer arms and electric fan: what they have in common

1. Step 1. Tweezer arms — is part of — Surgical forceps. Two springy legs.
2. Step 2. Surgical forceps — is made of — Bronze. Roman surgical forceps were bronze.
3. Step 3. Bronze — is material for — Propeller. Bronze does not rust in seawater.
4. Step 4. Propeller — is part of — Electric fan. The blades.

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