Hammerstone and steam turbine: what they have in common

1. Step 1. Hammerstone — is used in — Stone tool. A hammerstone for knapping.
2. Step 2. Stone tool — evolved into — Hammer. The first hammer was a stone in the hand.
3. Step 3. Hammer — evolved into — Steam hammer. A steam hammer is a hammer lifted by steam, used to forge huge parts.
4. Step 4. Steam hammer — has part — Boiler. A boiler supplies the steam.
5. Step 5. Boiler — is part of — Steam turbine. Steam from the boiler.

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