Convection and car: what they have in common

1. Step 1. Convection — is used in — Central heating. Radiators heat the air by convection.
2. Step 2. Central heating — has part — Boiler. A boiler.
3. Step 3. Boiler — is part of — Steam carriage. A boiler.
4. Step 4. Steam carriage — evolved into — Car. Self-propelled vehicles before the combustion engine were steam-powered.

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