Watermill and rock drill: what they have in common

1. Step 1. Watermill — has part — Water wheel. A water wheel drives the mill’s mechanism.
2. Step 2. Water wheel — evolved into — Turbine. The water turbine evolved from the water wheel.
3. Step 3. Turbine — is part of — Dental drill. An air-driven turbine handpiece.
4. Step 4. Dental drill — uses — Compressed air. Compressed air.
5. Step 5. Compressed air — is used in — Rock drill. Pneumatics.

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