Torsion balance and kiln: what they have in common

1. Step 1. Torsion balance — is used in — Universal gravitation. The Cavendish experiment — weighing the Earth.
2. Step 2. Universal gravitation — is used in — Water tower. Pressure from height.
3. Step 3. Water tower — is made of — Brick. Water towers are brick.
4. Step 4. Brick — uses — Kiln. Fired brick is stronger than mud brick.

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