Steel breastplate and bicycle: what they have in common

1. Step 1. Steel breastplate — is part of — Plate armour. A breastplate and backplate.
2. Step 2. Plate armour — evolved from — Chain mail. Plates over and instead of mail.
3. Step 3. Chain mail — works like — Roller chain. Interlinked links — a flexible metal structure.
4. Step 4. Roller chain — is part of — Electric bicycle. The chain drive from the pedals remains.
5. Step 5. Electric bicycle — evolved from — Bicycle. A bicycle with an electric drive.

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