iOS and newcomen engine: what they have in common

1. Step 1. iOS — evolved from — macOS. The mobile branch of macOS.
2. Step 2. macOS — was inspired by — Graphical user interface. The Macintosh interface was inspired by the Xerox Alto.
3. Step 3. Graphical user interface — was inspired by — Sketchpad. The ideas of direct manipulation of objects.
4. Step 4. Sketchpad — uses — Cathode-ray tube. A CRT screen.
5. Step 5. Cathode-ray tube — uses — Vacuum. Inside is a vacuum.
6. Step 6. Vacuum — is used in — Newcomen engine. Condensing the steam creates a vacuum under the piston.

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