Tablet computer and solar panel: what they have in common

1. Step 1. Tablet computer — has part — Touch layer (capacitive). A touchscreen.
2. Step 2. Touch layer (capacitive) — is part of — Display. Under the glass is a touch layer that registers touches.
3. Step 3. Display — evolved from — Liquid-crystal display. The first smartphones had LCD screens.
4. Step 4. Liquid-crystal display — is part of — Electronic calculator. An LCD display.
5. Step 5. Electronic calculator — has part — Solar panel. Many run on a solar cell.

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