It not only provided the outlet from which the water sprouted from the statue in the villa's garden but could even be found, in more miniature form, inside bowls from which you drank your water or wine at table.

ECONOMIST: Archaeology

One way round this for a swimming animal is to develop an outlet which allows urea to dissolve directly in the water as it swims, which is what the turtles seem to have done.

ECONOMIST: Softshell turtles urinate through their mouths

CO2 comes from burning coal or gas, and the heat typically 60 degrees Celcius would make the dry water, especially in its powdery form, evaporate if placed in a chimney or outlet.

FORBES: What Is Dry Water?