Crank and petri dish: what they have in common

1. Step 1. Crank — is part of — Meat grinder. A handle.
2. Step 2. Meat grinder — has part — Auger. An auger.
3. Step 3. Auger — is part of — Injection moulding. An auger feeds the plastic.
4. Step 4. Injection moulding — is used in — Plastic bottle. Preforms are moulded and then blown.
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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