Refrigerator and fitness tracker: what they have in common

1. Step 1. Refrigerator — is used in — Supermarket. Refrigerated displays.
2. Step 2. Supermarket — uses — Cash register. Tills.
3. Step 3. Cash register — evolved into — Self-checkout. A till.
4. Step 4. Self-checkout — has part — Touch layer (capacitive). A touchscreen.
5. Step 5. Touch layer (capacitive) — is part of — Smartwatch. A touchscreen.
6. Step 6. Smartwatch — evolved from — Fitness tracker. Tracker functions moved into watches.

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