Chemical reactor vessel and solar panel: what they have in common

1. Step 1. Chemical reactor vessel — is part of — Chemical plant. The vessel where the reaction takes place.
2. Step 2. Chemical plant — has part — Programmable logic controller. Process control automation.
3. Step 3. Programmable logic controller — has part — Microprocessor. A processor.
4. Step 4. Microprocessor — evolved from — Electronic calculator. The Intel 4004 was designed for a Busicom calculator.
5. Step 5. Electronic calculator — has part — Solar panel. Many run on a solar cell.

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