Firebox and personal computer: what they have in common

1. Step 1. Firebox — is part of — Kiln. A combustion chamber.
2. Step 2. Kiln — is used in — Lime. Lime is made by burning limestone.
3. Step 3. Lime — is material for — Plaster cast. Plaster of Paris is calcium sulfate.
4. Step 4. Plaster cast — is made of — Fibreglass. Modern casts.
5. Step 5. Fibreglass — is material for — Motherboard. The board is fibreglass laminate.
6. Step 6. Motherboard — is part of — Personal computer. The main board.

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