Plate armour and electric fan: what they have in common

1. Step 1. Plate armour — evolved from — Chain mail. Plates over and instead of mail.
2. Step 2. Chain mail — works like — Roller chain. Interlinked links — a flexible metal structure.
3. Step 3. Roller chain — is part of — Wright Flyer. The propellers were driven from the engine by bicycle chains — the Wrights were bicycle makers.
4. Step 4. Wright Flyer — uses — Wind tunnel. The Wrights built their own wind tunnel.
5. Step 5. Wind tunnel — has part — Electric fan. A fan.

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