Taximeter e multistage rocket: o que têm em comum

1. Passo 1. Taximeter — tem como parte — Mechanical clock. It measures the time of the ride.
2. Passo 2. Mechanical clock — evoluiu para — Quartz clock. Quartz clocks replaced mechanical ones: a vibrating quartz crystal took the place of the pendulum and balance.
3. Passo 3. Quartz clock — evoluiu para — Relógio atômico. The quartz oscillator is tuned to an atomic standard.
4. Passo 4. Relógio atômico — é utilizado em — GPS (satellite navigation). The satellites carry atomic clocks; the position is calculated from signal arrival times.
5. Passo 5. GPS (satellite navigation) — faz parte de — Reusable rocket. Navigation during landing.
6. Passo 6. Reusable rocket — evoluiu de — Multistage rocket. The first stage returns.

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