Computer mouse and aeroplane: what they have in common

1. Step 1. Computer mouse — has part — Image sensor. The motion sensor is a tiny camera.
2. Step 2. Image sensor — is part of — Digital camera. Instead of film a digital camera has an image sensor.
3. Step 3. Digital camera — has part — Flash memory. A memory card.
4. Step 4. Flash memory — is part of — Flight recorder. Memory.
5. Step 5. Flight recorder — is part of — Jet airliner. Flight recorders.
6. Step 6. Jet airliner — evolved from — Aeroplane. A jet aircraft.

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