Paper tissues and vacuum pump: what they have in common

1. Step 1. Paper tissues — is made of — Wood pulp. Cellulose.
2. Step 2. Wood pulp — is material for — Toilet paper. Cellulose.
3. Step 3. Toilet paper — is used in — Flush toilet. Hygiene.
4. Step 4. Flush toilet — has part — Valve. The cistern’s float valve.
5. Step 5. Valve — is part of — Boyle’s air pump. Valves.
6. Step 6. Boyle’s air pump — evolved from — Vacuum pump. An improved version of Guericke’s pump.

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