Toilet paper e typewriter: o que têm em comum

1. Passo 1. Toilet paper — é feito de — Wood pulp. Cellulose.
2. Passo 2. Wood pulp — é material para — Newspaper. Cheap newsprint.
3. Passo 3. Newspaper — utiliza — Rotary printing press. Mass print runs.
4. Passo 4. Rotary printing press — evoluiu de — Gutenberg printing press. Cylinders instead of a flat press.
5. Passo 5. Gutenberg printing press — tem como parte — Movable type. Text is set from metal type.
6. Passo 6. Movable type — funciona como — Typewriter. Each typebar carries a piece of movable type pressed against the paper.

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