X-ray machine and rocket: what they have in common

1. Step 1. X-ray machine — uses — Photographic film. An image on film.
2. Step 2. Photographic film — is made of — Celluloid. The first flexible film was celluloid.
3. Step 3. Celluloid — is made of — Cellulose. Nitrocellulose.
4. Step 4. Cellulose — is material for — Smokeless powder. Nitrocellulose.
5. Step 5. Smokeless powder — is material for — Solid rocket motor. The propellant is smokeless powder.
6. Step 6. Solid rocket motor — evolved from — Rocket. Gunpowder rockets.

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