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I believe that there was an invisible dragon in Carl Sagan's hair.
500 years ago, "The Dragon in My Garage" would have applied to any number of assertions that we presently accept as scientific fact, probably including nearly all of the assertions Sagan explained in his Cosmos series.
It is a parable about believing in things without "evidence." But everybody believes in things without "evidence". Even scientists. Anyone who currently believes in a unified field theory, or string theory, or any particular school of economic thought believes in things without "evidence".
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