Hydrogen car and mechanical clock: what they have in common

1. Step 1. Hydrogen car — is a kind of — Electric car. A hydrogen-powered electric car.
2. Step 2. Electric car — evolved into — Self-driving car. Most self-driving cars are built on electric platforms.
3. Step 3. Self-driving car — has part — GPS (satellite navigation). Satellite navigation.
4. Step 4. GPS (satellite navigation) — uses — Atomic clock. The satellites carry atomic clocks; the position is calculated from signal arrival times.
5. Step 5. Atomic clock — evolved from — Quartz clock. The quartz oscillator is tuned to an atomic standard.
6. Step 6. Quartz clock — evolved from — Mechanical clock. Quartz clocks replaced mechanical ones: a vibrating quartz crystal took the place of the pendulum and balance.

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