Compass and bellows: what they have in common

1. Step 1. Compass — uses — Magnetism. The needle aligns with the Earth’s magnetic field.
2. Step 2. Magnetism — is used in — Payment card. A magnetic stripe.
3. Step 3. Payment card — is used in — ATM. It dispenses money for a card.
4. Step 4. ATM — has part — Keyboard. A PIN pad.
5. Step 5. Keyboard — is part of — Pipe organ. Manuals were the first keyboards.
6. Step 6. Pipe organ — has part — Bellows. Bellows supply the air.

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