Polished limestone casing and fitness tracker: what they have in common

1. Step 1. Polished limestone casing — is part of — Egyptian pyramid. Polished limestone of the outer faces.
2. Step 2. Egyptian pyramid — uses — Plumb bob. Plumb bobs were used by Egypt’s builders.
3. Step 3. Plumb bob — uses — Universal gravitation. The string hangs vertical.
4. Step 4. Universal gravitation — is a kind of — Newton’s laws. Part of Newtonian mechanics.
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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