Cesium oven and steam turbine: what they have in common

1. Step 1. Cesium oven — is part of — Atomic clock. A source of the atomic beam.
2. Step 2. Atomic clock — is used in — GPS (satellite navigation). The satellites carry atomic clocks; the position is calculated from signal arrival times.
3. Step 3. GPS (satellite navigation) — is part of — Reusable rocket. Navigation during landing.
4. Step 4. Reusable rocket — has part — Liquid-propellant rocket engine. Liquid-propellant engines.
5. Step 5. Liquid-propellant rocket engine — has part — De Laval nozzle. A nozzle.
6. Step 6. De Laval nozzle — evolved from — Steam turbine. De Laval invented the nozzle for a steam turbine.

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