Howitzer and smartphone: what they have in common

1. Step 1. Howitzer — is a kind of — Cannon. An artillery piece.
2. Step 2. Cannon — is part of — Galleon. Cannons on the decks.
3. Step 3. Galleon — evolved from — Caravel. Larger and more heavily armed.
4. Step 4. Caravel — has part — Compass. A magnetic compass.
5. Step 5. Compass — works like — Hall sensor. Both sense the Earth’s magnetic field.
6. Step 6. Hall sensor — is part of — Smartphone. A magnetometer compass.

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