Ride-hailing app and fitness tracker: what they have in common

1. Step 1. Ride-hailing app — evolved from — Taximeter. A taxi without a taximeter.
2. Step 2. Taximeter — has part — Mechanical clock. It measures the time of the ride.
3. Step 3. Mechanical clock — includes — Wristwatch. A wristwatch is a mechanical clock made small enough to wear.
4. Step 4. Wristwatch — evolved into — Smartwatch. The form factor of a wristwatch.
5. Step 5. Smartwatch — evolved from — Fitness tracker. Tracker functions moved into watches.

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