Grill grate and sonar: 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 — is material for — Gunpowder. Gunpowder is a mix of saltpetre, sulphur and charcoal.
4. Step 4. Gunpowder — is used in — Landmine. Chinese mines of the 13th century were filled with gunpowder.
5. Step 5. Landmine — is used in — Minesweeper. Against sea mines.
6. Step 6. Minesweeper — has part — Sonar. Searching for mines.

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