Weight plates and plumbing: what they have in common

1. Step 1. Weight plates — is part of — Dumbbell. Weights.
2. Step 2. Dumbbell — uses — Universal gravitation. Weight.
3. Step 3. Universal gravitation — is used in — Water tower. Pressure from height.
4. Step 4. Water tower — is part of — Plumbing. Maintaining pressure.

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