Helical screw blade and payment card: what they have in common

1. Step 1. Helical screw blade — is part of — Archimedes’ screw. A spiral that lifts water as it turns.
2. Step 2. Archimedes’ screw — has part — Crank. A handle or rotary drive.
3. Step 3. Crank — is part of — Arithmometer. The handle for adding and subtracting.
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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