Scribal Terror tells about a guy who won an award for making a “refrigerator” that didn’t need to use electricity.

Here’s how it works. You take a smaller pot and put it inside a larger pot. Fill the space in between them with wet sand, and cover the top with a wet cloth. When the water evaporates, it pulls the heat out with it, making the inside cold. It’s a natural, cheap, easy-to-make refrigerator.

This could be one of those things Dielli’s people remembered that others forgot… or vice versa.

Update: A Bronze Age Refrigeratorwhich may have been like this has been found.

Parts of two ceramic “pithoi,” or pitchers, were found in the trench near the edge of the town. The pots, which could be as much as 2 meters tall, were kept in or near homes, suggesting that houses in the lower town stretched to the trench, another indication that Troy’s lower town was fully inhabited and the city was bigger than revealed in previous expeditions, Pernicka said.

“You can call them Bronze-Age refrigerators,” he said. “They were used for storing water, oil or maybe grain.”