Fume hood and headphones: what they have in common

1. Step 1. Fume hood — has part — Electric fan. A fan.
2. Step 2. Electric fan — has part — Propeller. The blades.
3. Step 3. Propeller — is part of — Quadcopter (drone). Air propellers.
4. Step 4. Quadcopter (drone) — has part — Lithium-ion battery. A lithium-polymer battery.
5. Step 5. Lithium-ion battery — is part of — Wireless earbuds. A battery.
6. Step 6. Wireless earbuds — evolved from — Headphones. Wireless headphones.

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