Box flaps and bicycle: what they have in common

1. Step 1. Box flaps — is part of — Cardboard box. Folding flaps.
2. Step 2. Cardboard box — is made of — Wood pulp. Corrugated board.
3. Step 3. Wood pulp — is used in — Paper machine. The raw material.
4. Step 4. Paper machine — works like — Conveyor belt. Fourdrinier’s endless wire mesh moves like a conveyor belt, forming the web of paper.
5. Step 5. Conveyor belt — has part — Ball bearing. The rollers turn on bearings.
6. Step 6. Ball bearing — is part of — Bicycle. Ball bearings in the hubs and bottom bracket let the wheels and pedals spin easily.

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