Double glazing and archimedes’ screw: what they have in common

1. Step 1. Double glazing — has part — Window glass. Two panes.
2. Step 2. Window glass — is part of — Greenhouse. It lets light in and holds heat.
3. Step 3. Greenhouse — uses — Irrigation. Watering plants.
4. Step 4. Irrigation — uses — Archimedes’ screw. The Archimedes’ screw lifted water for irrigation.

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