Revolver and petri dish: what they have in common

1. Step 1. Revolver — uses — Interchangeable parts. Colt used machine production of interchangeable parts.
2. Step 2. Interchangeable parts — is used in — LEGO bricks. Any brick fits any other.
3. Step 3. LEGO bricks — uses — Injection moulding. Precise moulding of the parts.
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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