Arch and air conditioner: what they have in common

1. Step 1. Arch — is part of — Aqueduct. Roman aqueducts rested on arcades.
2. Step 2. Aqueduct — works like — Sewerage. 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.
3. Step 3. Sewerage — has part — Sewage treatment plant. Treatment plants.
4. Step 4. Sewage treatment plant — has part — Compressor. Blowers supply oxygen to the microbes.
5. Step 5. Compressor — is part of — Air conditioner. A compressor.

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