Crank and smartphone: what they have in common

1. Step 1. Crank — is part of — Arithmometer. The handle for adding and subtracting.
2. Step 2. Arithmometer — evolved into — Electronic calculator. Electronics replaced mechanics.
3. Step 3. Electronic calculator — has part — Liquid-crystal display. An LCD display.
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.

Open Evothings