Thermal expansion and smartphone: what they have in common

1. Step 1. Thermal expansion — is used in — Clinical thermometer. The mercury column rises when heated.
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 — evolved into — Smartphone. Navigators were displaced by smartphones.

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