Virtual memory and oil well: what they have in common

1. Step 1. Virtual memory — uses — Hard disk drive. Paging to disk.
2. Step 2. Hard disk drive — has part — Ball bearing. Bearings (later fluid-dynamic ones).
3. Step 3. Ball bearing — is part of — Joint replacement. A “ball in a cup” joint — like a plain bearing.
4. Step 4. Joint replacement — is made of — Polyethylene. A polyethylene cup.
5. Step 5. Polyethylene — is made of — Crude oil. Made from petroleum products.
6. Step 6. Crude oil — uses — Oil well. Oil is extracted from wells.

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