Jeans and fitness tracker: what they have in common

1. Step 1. Jeans — has part — Rivet. Copper rivets on the pockets.
2. Step 2. Rivet — is part of — Eiffel Tower. 2.5 million rivets.
3. Step 3. Eiffel Tower — has part — Truss. Lattice trusses.
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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