Tang and turbine: what they have in common

1. Step 1. Tang — is part of — Knife. The part of the blade fixed in the handle.
2. Step 2. Knife — evolved from — Stone tool. The first knives were stone flakes.
3. Step 3. Stone tool — evolved into — Hammer. The first hammer was a stone in the hand.
4. Step 4. Hammer — evolved into — Trip hammer. A trip hammer is a hammer lifted and dropped by a water wheel.
5. Step 5. Trip hammer — has part — Water wheel. The shaft was turned by a water wheel.
6. Step 6. Water wheel — evolved into — Turbine. The water turbine evolved from the water wheel.

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