Toilet paper and typewriter: what they have in common

1. Step 1. Toilet paper — is made of — Wood pulp. Cellulose.
2. Step 2. Wood pulp — is material for — Newspaper. Cheap newsprint.
3. Step 3. Newspaper — uses — Rotary printing press. Mass print runs.
4. Step 4. Rotary printing press — evolved from — Gutenberg printing press. Cylinders instead of a flat press.
5. Step 5. Gutenberg printing press — has part — Movable type. Text is set from metal type.
6. Step 6. Movable type — works like — Typewriter. Each typebar carries a piece of movable type pressed against the paper.

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