Smart home and radar: what they have in common

1. Step 1. Smart home — has part — Smart speaker. The control hub.
2. Step 2. Smart speaker — has part — Loudspeaker. A loudspeaker.
3. Step 3. Loudspeaker — has part — Permanent magnet. A permanent magnet.
4. Step 4. Permanent magnet — is part of — Magnetron. A magnet makes the electrons spiral.
5. Step 5. Magnetron — is part of — Radar. The cavity magnetron made compact radar possible.

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