Bicycle brake and mechanical clock: what they have in common

1. Step 1. Bicycle brake — is made of — Vulcanized rubber. The pads are rubber.
2. Step 2. Vulcanized rubber — is material for — Fitness tracker. The strap is silicone.
3. Step 3. Fitness tracker — evolved into — Smartwatch. Tracker functions moved into watches.
4. Step 4. Smartwatch — evolved from — Wristwatch. The form factor of a wristwatch.
5. Step 5. Wristwatch — is a kind of — Mechanical clock. A wristwatch is a mechanical clock made small enough to wear.

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