Grill grate and incandescent light bulb: what they have in common

1. Step 1. Grill grate — is part of — Grill. A grate over the coals.
2. Step 2. Grill — uses — Charcoal. Charcoal.
3. Step 3. Charcoal — uses — Combustion. Burning wood without air.
4. Step 4. Combustion — is used in — Oil lamp. Burning oil gives the light.
5. Step 5. Oil lamp — evolved into — Incandescent light bulb. The electric lamp replaced oil and gas lamps.

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