Spreadsheet and hydraulic press: what they have in common

1. Step 1. Spreadsheet — uses — Personal computer. It ran on the Apple II.
2. Step 2. Personal computer — has part — Microprocessor. The PC became possible thanks to the microprocessor.
3. Step 3. Microprocessor — is part of — Insulin pump. A dosing controller.
4. Step 4. Insulin pump — has part — Piston. The reservoir’s plunger.
5. Step 5. Piston — is part of — Hydraulic cylinder. The piston is moved by liquid.
6. Step 6. Hydraulic cylinder — is part of — Hydraulic press. Two cylinders of different diameters.

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