Separator bowl drum and payment card: what they have in common

1. Step 1. Separator bowl drum — is part of — Cream separator. A fast-spinning drum with discs.
2. Step 2. Cream separator — has part — Gear. A gear train spins up the bowl.
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 — Integrated circuit. A chip.
6. Step 6. Integrated circuit — is part of — Payment card. An EMV chip.

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