Bolt and nut and fitness tracker: what they have in common

1. Step 1. Bolt and nut — is used in — Wrench. A wrench turns nuts.
2. Step 2. Wrench — is made of — Wrought iron. Wrenches are wrought iron.
3. Step 3. Wrought iron — is material for — Truss. Then — wrought iron.
4. Step 4. Truss — uses — Newton’s laws. A triangle is a rigid shape.
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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