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A comment on The regress argument against Cartesian skepticism (2012) [pdf]. Parent comment

Re:The regress argument against Cartesian skepticism (2012) ... by Strilanc on Saturday September 15, 2018 @11:04AM (#17994522)
Only if you subscribe to some pretty tortured interpretations of quantum mechanics. QM still describes an objective state of the external world, and exactly how it changes over time.
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Re:The regress argument against Cartesian skepticism (2012) ... by Quekid5 on Saturday September 15, 2018 @12:14PM (#17994808)
I don't think that's what the poster meant. I think it was probably more along the lines of how you experience e.g. 'light' vs. what it actually is:

   https://www.youtube.com/watch?v=FjHJ7FmV0M4
(The vast majority of light is effectively invisible to you.)
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