Drill press and smart meter: what they have in common

1. Step 1. Drill press — works like — Electric drill. A drill press and a hand drill do the same — spin a bit — but the press is fixed to a bench.
2. Step 2. Electric drill — has part — Gear. A reduction gear.
3. Step 3. Gear — is part of — Arithmometer. Gear wheels do the counting.
4. Step 4. Arithmometer — evolved into — Electronic calculator. Electronics replaced mechanics.
5. Step 5. Electronic calculator — has part — Liquid-crystal display. An LCD display.
6. Step 6. Liquid-crystal display — is part of — Smart meter. A display.

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