Gravity flow e pulseira de atividade: o que têm em comum

1. Passo 1. Gravity flow — é utilizado em — Water clock (clepsydra). Water flows out at a constant rate under gravity.
2. Passo 2. Water clock (clepsydra) — evoluiu para — Mechanical clock. Mechanical clocks replaced water clocks, swapping the flow of water for an escapement.
3. Passo 3. Mechanical clock — inclui — Wristwatch. A wristwatch is a mechanical clock made small enough to wear.
4. Passo 4. Wristwatch — evoluiu para — Smartwatch. The form factor of a wristwatch.
5. Passo 5. Smartwatch — evoluiu de — Pulseira de atividade. Tracker functions moved into watches.

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