Surpring discovery in old homes suggesting atomic radiation was used for heating

Let’s see how the old world really heated their homes was wood really used in these? They tell us the symbol for radiation was the result of a doodle at Berkeley in 1946. A strange coincidence that these symbols appeared long ago.
There is an obvious problem with these devices? They are radioactive! Still, it shows an interesting piece of history. It really seems impossible to heat all those large rooms with open fireplaces like these ones.
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