French press and personal computer: what they have in common

1. Step 1. French press — has part — Piston. A plunger with a mesh.
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 — is part of — Personal computer. The PC became possible thanks to the microprocessor.

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