Sunscreen and centrifugal pump: what they have in common

1. Step 1. Sunscreen — is a kind of — Cosmetics. Cosmetics.
2. Step 2. Cosmetics — includes — Nail polish. Decorative cosmetics for nails.
3. Step 3. Nail polish — is made of — Cellulose. The film is formed by nitrocellulose: cellulose treated with nitric acid.
4. Step 4. Cellulose — is material for — Cellophane. Cellulose.
5. Step 5. Cellophane — is material for — Haemodialysis machine. Kolff’s membrane was a cellophane tube.
6. Step 6. Haemodialysis machine — has part — Centrifugal pump. A blood pump (peristaltic).

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