Mercury bulb and atomic clock: what they have in common

1. Step 1. Mercury bulb — is part of — Clinical thermometer. A lower ball.
2. Step 2. Clinical thermometer — evolved into — Digital thermometer. A replacement for the mercury thermometer.
3. Step 3. Digital thermometer — has part — Liquid-crystal display. The reading is on an LCD.
4. Step 4. Liquid-crystal display — is part of — Car navigator. A screen.
5. Step 5. Car navigator — uses — GPS (satellite navigation). GPS.
6. Step 6. GPS (satellite navigation) — uses — Atomic clock. The satellites carry atomic clocks; the position is calculated from signal arrival times.

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