Toaster and rocket: what they have in common

1. Step 1. Toaster — has part — Bimetallic strip. The timer of many toasters is bimetallic.
2. Step 2. Bimetallic strip — is part of — Hair dryer. Overheating protection: when hot, a bimetallic strip bends and breaks the circuit.
3. Step 3. Hair dryer — has part — Impeller. An impeller on the motor shaft pushes air through the heater.
4. Step 4. Impeller — is part of — Centrifugal pump. The impeller accelerates the liquid.
5. Step 5. Centrifugal pump — is part of — Liquid-propellant rocket engine. Turbopumps deliver the propellant.
6. Step 6. Liquid-propellant rocket engine — evolved from — Rocket. Goddard switched to liquid fuel.

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