Paddle steamer and payment card: what they have in common

1. Step 1. Paddle steamer — evolved into — Screw steamship. The propeller proved more efficient than paddle wheels.
2. Step 2. Screw steamship — includes — Ironclad. An ironclad is a steamship clad in armour.
3. Step 3. Ironclad — has part — Gyrocompass. Steel ships distort a magnetic compass.
4. Step 4. Gyrocompass — evolved from — Compass. A compass without a magnet.
5. Step 5. Compass — uses — Magnetism. The needle aligns with the Earth’s magnetic field.
6. Step 6. Magnetism — is used in — Payment card. A magnetic stripe.

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