Sundial et fitness tracker : ce qu'ils ont en commun

1. Étape 1. Sundial — fonctionne comme — Water clock (clepsydra). Two ancient ways to measure time: by a shadow and by flowing water.
2. Étape 2. Water clock (clepsydra) — a évolué en — Mechanical clock. Mechanical clocks replaced water clocks, swapping the flow of water for an escapement.
3. Étape 3. Mechanical clock — comprend — Wristwatch. A wristwatch is a mechanical clock made small enough to wear.
4. Étape 4. Wristwatch — a évolué en — Smartwatch. The form factor of a wristwatch.
5. Étape 5. Smartwatch — a évolué de — Fitness tracker. Tracker functions moved into watches.

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