Insulin pump and oil lamp: what they have in common

1. Step 1. Insulin pump — has part — Piston. The reservoir’s 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 — Davy lamp. Protection against methane explosions.
5. Step 5. Davy lamp — has part — Wick. A wick.
6. Step 6. Wick — is part of — Oil lamp. The wick feeds oil to the flame.

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