Solar-powered harvester sucks drinkable water out of thin air

First, the lid of the box is left open to the air overnight, when the higher humidity lets the MOF grains suck in water molecules from the air. In the morning, the lid is replaced and the Sun heats the box up like a greenhouse, triggering the MOFs to release the trapped water vapor. This condenses on the walls of the outer box and runs down to the bottom, where it can be collected.

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