Tissue box and boiler: what they have in common

1. Step 1. Tissue box — is part of — Paper tissues. It dispenses tissues one at a time.
2. Step 2. Paper tissues — is made of — Wood pulp. Cellulose.
3. Step 3. Wood pulp — is material for — Newspaper. Cheap newsprint.
4. Step 4. Newspaper — uses — Rotary printing press. Mass print runs.
5. Step 5. Rotary printing press — has part — Watt steam engine. The first rotary presses were steam-driven.
6. Step 6. Watt steam engine — has part — Boiler. The boiler supplies steam.

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