Theremin and rocket: what they have in common

1. Step 1. Theremin — has part — Oscillator. Beat-frequency oscillators.
2. Step 2. Oscillator — is part of — Atomic clock. A quartz oscillator is tuned to the atoms.
3. Step 3. Atomic clock — is used in — GPS (satellite navigation). The satellites carry atomic clocks; the position is calculated from signal arrival times.
4. Step 4. GPS (satellite navigation) — is part of — Reusable rocket. Navigation during landing.
5. Step 5. Reusable rocket — has part — Liquid-propellant rocket engine. Liquid-propellant engines.
6. Step 6. Liquid-propellant rocket engine — evolved from — Rocket. Goddard switched to liquid fuel.

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