Crown cap and payment card: what they have in common

1. Step 1. Crown cap — is part of — Glass bottle. A cap.
2. Step 2. Glass bottle — evolved into — Plastic bottle. A replacement for glass.
3. Step 3. Plastic bottle — is made of — PET. A PET bottle.
4. Step 4. PET — is material for — Floppy disk. The disk is Mylar (PET) with a magnetic coating.
5. Step 5. Floppy disk — uses — Magnetism. Magnetic recording.
6. Step 6. Magnetism — is used in — Payment card. A magnetic stripe.

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