Hydrogen car e mechanical clock: o que têm em comum

1. Passo 1. Hydrogen car — é um tipo de — Carro elétrico. A hydrogen-powered electric car.
2. Passo 2. Carro elétrico — evoluiu para — Self-driving car. Most self-driving cars are built on electric platforms.
3. Passo 3. Self-driving car — tem como parte — GPS (satellite navigation). Satellite navigation.
4. Passo 4. GPS (satellite navigation) — utiliza — Relógio atômico. The satellites carry atomic clocks; the position is calculated from signal arrival times.
5. Passo 5. Relógio atômico — evoluiu de — Quartz clock. The quartz oscillator is tuned to an atomic standard.
6. Passo 6. Quartz clock — evoluiu de — Mechanical clock. Quartz clocks replaced mechanical ones: a vibrating quartz crystal took the place of the pendulum and balance.

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