Pregnancy test and camera: what they have in common

1. Step 1. Pregnancy test — is made of — Cellulose. The strip is a nitrocellulose membrane.
2. Step 2. Cellulose — is material for — Celluloid. Nitrocellulose.
3. Step 3. Celluloid — is material for — Photographic film. The first flexible film was celluloid.
4. Step 4. Photographic film — is used in — Kodak camera. Roll film.
5. Step 5. Kodak camera — is a kind of — Camera. A camera.

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