Magnetron and zip: what they have in common

1. Step 1. Magnetron — has part — Permanent magnet. A magnet makes the electrons spiral.
2. Step 2. Permanent magnet — uses — Magnetism. A permanent field.
3. Step 3. Magnetism — is used in — Payment card. A magnetic stripe.
4. Step 4. Payment card — evolved from — Paper money. The next form of money.
5. Step 5. Paper money — is used in — Wallet. It holds money.
6. Step 6. Wallet — has part — Zip. A zipped coin compartment.

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