Gravity flow und fitness tracker: was sie gemeinsam haben

1. Schritt 1. Gravity flow — wird verwendet in — Water clock (clepsydra). Water flows out at a constant rate under gravity.
2. Schritt 2. Water clock (clepsydra) — entwickelte sich zu — Mechanical clock. Mechanical clocks replaced water clocks, swapping the flow of water for an escapement.
3. Schritt 3. Mechanical clock — umfasst — Wristwatch. A wristwatch is a mechanical clock made small enough to wear.
4. Schritt 4. Wristwatch — entwickelte sich zu — Smartwatch. The form factor of a wristwatch.
5. Schritt 5. Smartwatch — entwickelte sich aus — Fitness tracker. Tracker functions moved into watches.

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