Firework stars and radar: what they have in common

1. Step 1. Firework stars — is part of — Fireworks. Pellets with metal salts that give the colour.
2. Step 2. Fireworks — uses — Gunpowder. Gunpowder.
3. Step 3. Gunpowder — is used in — Anti-aircraft gun. Gunpowder propels the projectile.
4. Step 4. Anti-aircraft gun — uses — Radar. Radar guidance.

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