Electric stove and railway track: what they have in common

1. Step 1. Electric stove — has part — Thermostat. A regulator.
2. Step 2. Thermostat — is part of — Convection oven. A thermostat.
3. Step 3. Convection oven — has part — Electric fan. A fan circulates the air.
4. Step 4. Electric fan — is part of — Wind tunnel. A fan.
5. Step 5. Wind tunnel — is used in — Wright Flyer. The Wrights built their own wind tunnel.
6. Step 6. Wright Flyer — uses — Railway track. The Flyer had no wheels: it took off along a wooden rail.

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