Churn dasher and turbojet engine: what they have in common

1. Step 1. Churn dasher — is part of — Butter churn. A dasher plunger churns the cream.
2. Step 2. Butter churn — uses — Lever. A dasher.
3. Step 3. Lever — is part of — Vending machine. A coin presses a lever that opens the dispenser.
4. Step 4. Vending machine — was inspired by — Heron’s aeolipile. Heron described both a holy-water dispenser and the aeolipile; the dispenser is the prototype of the vending machine.
5. Step 5. Heron’s aeolipile — evolved into — Turbine. The aeolipile is the oldest ancestor of the steam turbine.
6. Step 6. Turbine — is part of — Turbojet engine. The turbine drives the compressor.

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