The mystery of a bathhouse heated by one candle. Esfahan. Iran
The bathhouse was built by a Baha'i sheikh in the 16th and 17th centuries. According to legend, it was heated with just one candle. But how is this possible?
Now scientists are trying in every possible way to explain this, and one of the theories is the combustion of gases from the sewer under the bathhouse.
But there is another theory - atomic energy. Perhaps something emitted a glow and, from afar, looked like a candle. Then everything is logical, because it was forbidden to enter the room with this candle (radiation?) Hence the word radius, which first appeared in the same 16th century and meant a safe distance to the radioactive substance (to the candle in that room). It comes from the word Radius (radiance, shine, radiation, ray)