as far as anyone knows

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as far as anyone knows

 and so far as anyone knows; to the best of one's knowledge
to the limits of anyone's knowledge. (The anyone can be replaced with a more specific noun or pronoun.) As far as anyone knows, this is the last of the great herds of buffalo. Far as I know, this is the best spot to sit. Q: Are the trains on time? A: To the best of my knowledge, all the trains are on time today.
See also: anyone, far, know