Cloud chamber and electronic calculator: what they have in common

1. Step 1. Cloud chamber — has part — Piston. A sudden expansion supersaturates the vapour.
2. Step 2. Piston — is part of — Insulin pump. The reservoir’s plunger.
3. Step 3. Insulin pump — has part — Microprocessor. A dosing controller.
4. Step 4. Microprocessor — evolved from — Electronic calculator. The Intel 4004 was designed for a Busicom calculator.

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