All  

refrigerator

Researchers test their theory by packing the shaft with snow. Image: Peter-Andrew Schwarz

Swiss Archaeologists’ Refrigerator Theory Gets a Cool Result

Swiss archaeologists seem to have solved a mystery at a famous Roman site. They have come to the conclusion that some mysterious shafts at the archaeological site were used as a method of...
Looking up inside a Yakhchal

Ancient Advanced Technology: 2,400-Year-Old Yakhchals Kept Ice in the Desert

The ancients were cleverer than some people today assume. They didn’t have rockets or electricity, at least no indisputable proof has been found of such technologies, but they did come up with...