Caravel and telephone: what they have in common

1. Step 1. Caravel — has part — Compass. A magnetic compass.
2. Step 2. Compass — has part — Permanent magnet. The needle is a magnet.
3. Step 3. Permanent magnet — is part of — Loudspeaker. A permanent magnet.
4. Step 4. Loudspeaker — is part of — Telephone. The earpiece reproduces the other person’s voice.

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