refers to:
(1) Actual scientific discoveries or inventions that are so hard to believe as to be commonly mistaken for science fiction.

(2) A speculative technological discovery or invention specifically referred to in past science fiction writing that has since become true.
Apparently an invisibility cloak has become science faction as military scientists have discovered a reflective material that can bend light around a subject making the subject effectively invisible.
by Gregory B Russell February 11, 2009

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