Grill and rocket: what they have in common

1. Step 1. Grill — uses — Charcoal. Charcoal.
2. Step 2. Charcoal — is material for — Gunpowder. Gunpowder is a mix of saltpetre, sulphur and charcoal.
3. Step 3. Gunpowder — is used in — Rocket. The first rockets were powered by gunpowder.

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