Boyle’s air pump and headphones: what they have in common

1. Step 1. Boyle’s air pump — uses — Vacuum. The pump draws out the air.
2. Step 2. Vacuum — is used in — Magnetron. It works in a vacuum.
3. Step 3. Magnetron — has part — Permanent magnet. A magnet makes the electrons spiral.
4. Step 4. Permanent magnet — is part of — Headphones. A magnet moves the diaphragm.

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