Differential and steam turbine: what they have in common

1. Step 1. Differential — is part of — Truck. Differentials in the drive axles.
2. Step 2. Truck — is part of — Multiple rocket launcher. On a truck chassis.
3. Step 3. Multiple rocket launcher — uses — Solid rocket motor. Rockets.
4. Step 4. Solid rocket motor — has part — De Laval nozzle. A nozzle.
5. Step 5. De Laval nozzle — evolved from — Steam turbine. De Laval invented the nozzle for a steam turbine.

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