Planetary gear and headphones: what they have in common

1. Step 1. Planetary gear — is part of — Wind turbine. A gearbox raises the speed.
2. Step 2. Wind turbine — has part — Neodymium magnet. Direct-drive generators.
3. Step 3. Neodymium magnet — is a kind of — Permanent magnet. A kind of magnet.
4. Step 4. Permanent magnet — is part of — Headphones. A magnet moves the diaphragm.

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