4 ms·

Ancient desert interior climate control: http://en.wikipedia.org/wiki/Windcatcher http://en.wikipedia.org/wiki/Windcatcher http://en.wikipedia.org/wiki/Yakhch

• chopsueyar 15y ago
  From the wikipedia Yakhchal article: ...made out of a special mortar called sārooj, composed of sand, clay, egg whites, lime, goat hair, and ash in specific proportions, and which was resistant to heat transfer. This mixture was thought to be completely water impenetrable. Organic styrofoam!