Winding windlass and electric fan: what they have in common

1. Step 1. Winding windlass — is part of — Catapult. It draws the lever.
2. Step 2. Catapult — evolved into — Trebuchet. The trebuchet replaced torsion engines as a more powerful siege machine.
3. Step 3. Trebuchet — is made of — Stone. It hurled stone balls.
4. Step 4. Stone — is material for — Oven. The oven floor was laid with stone, which holds heat.
5. Step 5. Oven — works like — Air fryer. An air fryer is a small oven where a fan drives the hot air.
6. Step 6. Air fryer — has part — Electric fan. A fan.

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