Syringe and electric fan: what they have in common

1. Step 1. Syringe — has part — Piston. A plunger.
2. Step 2. Piston — is part of — Newcomen engine. Atmospheric pressure moves the piston.
3. Step 3. Newcomen engine — uses — Coal mine. Pumping water out of mines.
4. Step 4. Coal mine — uses — Mine ventilation. Airing the workings.
5. Step 5. Mine ventilation — has part — Electric fan. Fans.

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