Clipper and smartphone: what they have in common

1. Step 1. Clipper — evolved from — Galleon. The sailing fleet developed towards speed.
2. Step 2. Galleon — evolved from — Caravel. Larger and more heavily armed.
3. Step 3. Caravel — has part — Compass. A magnetic compass.
4. Step 4. Compass — works like — Hall sensor. Both sense the Earth’s magnetic field.
5. Step 5. Hall sensor — is part of — Smartphone. A magnetometer compass.

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