Paint and radar: what they have in common

1. Step 1. Paint — evolved into — Nail polish. Modern nail polish was modelled on the quick-drying nitrocellulose car paint of the 1920s.
2. Step 2. Nail polish — is made of — Cellulose. The film is formed by nitrocellulose: cellulose treated with nitric acid.
3. Step 3. Cellulose — is material for — Smokeless powder. Nitrocellulose.
4. Step 4. Smokeless powder — evolved from — Gunpowder. A replacement for black powder.
5. Step 5. Gunpowder — is used in — Anti-aircraft gun. Gunpowder propels the projectile.
6. Step 6. Anti-aircraft gun — uses — Radar. Radar guidance.

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