Trouser legs and fitness tracker: what they have in common

1. Step 1. Trouser legs — is part of — Trousers. Two legs.
2. Step 2. Trousers — is made of — Wool. The oldest trousers (Yanghai) were sewn from wool.
3. Step 3. Wool — is material for — Billiards. The baize.
4. Step 4. Billiards — uses — Newton’s laws. Collisions of balls.
5. Step 5. Newton’s laws — is used in — Accelerometer. The sensor measures the force of inertia.
6. Step 6. Accelerometer — is part of — Fitness tracker. A pedometer.

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