Everything you have said here is under the assumption that humans know everything. We as a species know very very little about the universe we reside in, and the dimensions we don't. A rather small, close minded approach to a subject science can neither prove nor disprove because we don't have the appropriate instruments to measure things our senses filter out. It's like radio waves and infra red. 200 years ago people would have laughed at the idea that there are invisible waves and light spectrums, yet they've always been there, even though we could not observe them until recently. Science is not the end all of everything, as most things in science are merely theories, and usually proven wrong by another scientific discovery
No, it's not under that assumption. Its under the assumption that the forces acting upon real matter are pretty well understood and can be detected.
Moreover, its predicated upon the fact that the human visual perception system is understood pretty damn well and that we have instruments that can detect far more than the human eye...
Ergo, any REAL phenomena that humans can SEE, we CAN detect.
Also- don't toss out the word 'theory' along with the word "mere".
That attitude demonstrates that you have no idea what a theory is, nor that theory is considered, in science, to be vastly superior than any mere "fact".
A fact means almost nothing by itself. One of my siblings has blue eyes.
That is a fact and it tells me nothing more than that.
But the THEORY of genetics explain WHY only one out of four siblings has blue eyes, and it accurately predicts how often that trait will appear.
Further, it explains the mechanism underlying the phenomenon in a way that enables scientists to create drugs that target specific gene expression, screen for genetic disease, or figure out how the HIV virus gets into your cells.
Theory, gives us POWER over reality. ..gives us the ability to accurately predict the future and manipulate matter and energy.
Because of theory, Sand, metal ore and oil has been turned into the machine you use to cruise the forum...
And all the quaint and imbecilic notions about ghosts haven't produced a thing other than money in the pockets of the con artists selling you that fantasy.
Sorry.
No we don't know everything.
Be we do know that there is no credible evidence for ghosts.
And while it may be possible that there is evidence we simply can not detect...
I would point out what a weak argument that is given that EVERYTHING that DOES NOT EXIST, also leaves no detectable evidence.
When you can't find anything, despite the best efforts off hundreds of years in looking... the likelihood is that there is nothing to find.
