Fluoride and gutenberg printing press: what they have in common

1. Step 1. Fluoride — is material for — Toothpaste. Fluoride.
2. Step 2. Toothpaste — is used in — Toothbrush. Toothpaste.
3. Step 3. Toothbrush — is made of — Plant fibre. The bristles were hog hair, later nylon.
4. Step 4. Plant fibre — is used in — Loom. Cloth is woven from threads spun from fibres.
5. Step 5. Loom — includes — Jacquard loom. A loom with punched cards.
6. Step 6. Jacquard loom — works like — Gutenberg printing press. An analogy, not proven influence: both set type and a chain of punched cards are a replaceable pattern that a machine reproduces over and over.

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