Urban planning and hammer: what they have in common

1. Step 1. Urban planning — uses — Sewerage. Infrastructure.
2. Step 2. Sewerage — uses — Gravity flow. Waste water flows down a gradient.
3. Step 3. Gravity flow — is used in — Water wheel. Falling or flowing water turns the wheel.
4. Step 4. Water wheel — is part of — Trip hammer. The shaft was turned by a water wheel.
5. Step 5. Trip hammer — evolved from — Hammer. A trip hammer is a hammer lifted and dropped by a water wheel.

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