Battering ram and plumbing: what they have in common

1. Step 1. Battering ram — works like — Pile driver. A battering ram and a pile driver both strike with a heavy weight: one breaks gates, the other drives piles.
2. Step 2. Pile driver — uses — Universal gravitation. A falling 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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