Cardboard box and personal computer: what they have in common

1. Step 1. Cardboard box — is made of — Wood pulp. Corrugated board.
2. Step 2. Wood pulp — is used in — Paper machine. The raw material.
3. Step 3. Paper machine — works like — Conveyor belt. Fourdrinier’s endless wire mesh moves like a conveyor belt, forming the web of paper.
4. Step 4. Conveyor belt — has part — Ball bearing. The rollers turn on bearings.
5. Step 5. Ball bearing — is part of — Hard disk drive. Bearings (later fluid-dynamic ones).
6. Step 6. Hard disk drive — is part of — Personal computer. A hard disk.

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