Lodestone and petri dish: what they have in common

1. Step 1. Lodestone — uses — Magnetism. A natural magnet.
2. Step 2. Magnetism — is used in — Floppy disk. Magnetic recording.
3. Step 3. Floppy disk — is made of — PET. The disk is Mylar (PET) with a magnetic coating.
4. Step 4. PET — is material for — Plastic bottle. A PET bottle.
5. Step 5. Plastic bottle — has part — Pot lid. A polyethylene lid.
6. Step 6. Pot lid — is part of — Petri dish. A cap.

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