Electrical conduction and plumbing: what they have in common

1. Step 1. Electrical conduction — is used in — Light switch. Contacts close the circuit.
2. Step 2. Light switch — is made of — Porcelain. The body is porcelain.
3. Step 3. Porcelain — is material for — Flush toilet. Toilet bowls are earthenware and porcelain.
4. Step 4. Flush toilet — uses — Sewerage. Draining the waste.
5. Step 5. Sewerage — works like — Aqueduct. Both systems carry water by gravity through channels: one drains waste, the other supplies water; the drains of Mohenjo-daro are older than the Roman aqueducts.
6. Step 6. Aqueduct — works like — Plumbing. An aqueduct brings water to a city, plumbing distributes it inside; Minoan pipes are older than the Roman aqueducts.

Open Evothings