One Of Life's Unanswered Puzzles.
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For more on marking an answer as the "Best Answer", please visit our FAQ.Which is why all of New York's subway trains are coated in the same heat resistant ceramic tiles that Rockwell use on NASA's space shuttles. And all the big sky-scrapers keep falling over.
Its not steam. Its hot air from the sewers condensing in the cold air above ground, similar to seeing your own breath on a cold day.
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