Sawmill and monitor: what they have in common

1. Step 1. Sawmill — has part — Crank. A crank turns the wheel’s rotation into the stroke of the saw.
2. Step 2. Crank — is part of — Arithmometer. The handle for adding and subtracting.
3. Step 3. Arithmometer — evolved into — Electronic calculator. Electronics replaced mechanics.
4. Step 4. Electronic calculator — has part — Liquid-crystal display. An LCD display.
5. Step 5. Liquid-crystal display — is part of — Monitor. Then LCDs.

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