Geothermal power station and knife: what they have in common

1. Step 1. Geothermal power station — has part — Steam turbine. Steam from underground turns the turbines.
2. Step 2. Steam turbine — has part — Boiler. Steam from the boiler.
3. Step 3. Boiler — is part of — Steam hammer. A boiler supplies the steam.
4. Step 4. Steam hammer — evolved from — Hammer. A steam hammer is a hammer lifted by steam, used to forge huge parts.
5. Step 5. Hammer — evolved from — Stone tool. The first hammer was a stone in the hand.
6. Step 6. Stone tool — evolved into — Knife. The first knives were stone flakes.

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