Propeller shaft and stone tool: what they have in common

1. Step 1. Propeller shaft — is a kind of — Shaft. A shaft.
2. Step 2. Shaft — uses — Torque. A shaft transmits torque.
3. Step 3. Torque — is used in — Screwdriver. The handle creates torque.
4. Step 4. Screwdriver — has part — Handle. A handle.
5. Step 5. Handle — is part of — Adze. A handle for swinging.
6. Step 6. Adze — evolved from — Stone tool. Neolithic adzes were stone.

Open Evothings