Wrought iron and fitness tracker: what they have in common

1. Step 1. Wrought iron — is material for — Truss. Then — wrought iron.
2. Step 2. Truss — uses — Newton’s laws. A triangle is a rigid shape.
3. Step 3. Newton’s laws — is used in — Accelerometer. The sensor measures the force of inertia.
4. Step 4. Accelerometer — is part of — Fitness tracker. A pedometer.

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