Anchor and radar: what they have in common

1. Step 1. Anchor — is part of — Sailing ship. An anchor.
2. Step 2. Sailing ship — has part — Compass. A magnetic compass.
3. Step 3. Compass — has part — Permanent magnet. The needle is a 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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