Jet airliner and monitor: what they have in common

1. Step 1. Jet airliner — has part — Radar. A weather radar.
2. Step 2. Radar — works like — Sonar. The same echolocation principle: sound in water instead of radio waves.
3. Step 3. Sonar — works like — Ultrasound scanner. A medical sonar: the same echo principle.
4. Step 4. Ultrasound scanner — has part — Monitor. A screen.

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