the sky is blue because you are told it is, you can be told blues wave length and measure it
I guess the truth is only what we can perceive through our 5 senses. Everything else is just a guess.
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we perceive via our senses thru other instruments, question is is it all subjective, schrödinger's cat, reality becomes unobservable as we get to its smallest parts
YOU ARE HURTING MY BRAIN. This is the truth, a fact and my opinion.