Glass capillary tube and gyroscope: what they have in common

1. Step 1. Glass capillary tube — is part of — Clinical thermometer. A fine channel for mercury.
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 — evolved into — Display. The first smartphones had LCD screens.
5. Step 5. Display — is part of — VR headset. A VR headset has two displays, one per eye.
6. Step 6. VR headset — has part — Gyroscope. Head tracking.

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