Plastic bag and centrifugal pump: what they have in common

1. Step 1. Plastic bag — is made of — Polyethylene. Polyethylene.
2. Step 2. Polyethylene — is material for — Joint replacement. A polyethylene cup.
3. Step 3. Joint replacement — has part — Ball bearing. A “ball in a cup” joint — like a plain bearing.
4. Step 4. Ball bearing — is part of — Washing machine. Drum bearings.
5. Step 5. Washing machine — has part — Centrifugal pump. A drain pump.

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