Among animals, making light (outside their body) seems to be an occupation engaged in only by man. The photo above is of a thorium mantle [1] incandescing white hot. Wikipedia [2] has more info.
Atom bomb, anyone? (about a million mantles and you could make one)
Light your cigarette in the invisible heat above the glass chimney? Lean over the chimney too far and ignite your hair too!
A little radium in your lungs? Where's that little piece of missing "ceramic" weave?
The perception of the homey and comfortable atmosphere surrounding a gas mantle lamp probably is a miss-perception.
But in the big picture there are many "elements" and chemicals coming into contact with us of which we are entirely unaware.
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