If this is the case, then what was it exactly that was happening in the mid to late 1800s when Darwin came on the scene with Huxley's help. Evolution was claimed to “truth” by Darwin, but he said it is provisional. So, is scientific knowledge and/or truth “provisional”? Or do we really “know” some truth about our world.
What did we really "know" with certainty until we discovered DNA and it's effect on organisms? We have a good working 'theory' and some observational supporting evidence of course, but I wouldn't necessarily call it 'knowledge' of biology, certainly not on the order of information that we now have via active experimentation. We know for instance that HOX genes can and do cause macroevolutionary changes, but that wasn't "known" by Darwin.
And if we can admit we don't really know how something happens, or that there is definitely room to find out more about some phenomenon about our world, then how is it we say we “know”?
IMO "knowledge" of cause/effect relationships is real "knowledge". Assumptions about the cause aren't actual "knowledge", although it could be considered a good theory to explain a specific observation.
Furthermore, if indeed we know something about the world, but we recognize that we came to that knowledge through much more than just experemental trial and error, then isn't speculation a part of the scientific enterprise which is wrapped up into the 'why' we think what we do about the world?
In the case of evolutionary theory, sure, we started with a 'theory' that potentially explained some important aspects about the diversity of life on Earth, and various fossil records. Without 'knowledge" of the DNA aspects however, it was just a good "theory".
So, you wouldn't specify the developments in the thinking of Copernicus or Kepler constitute forms of “discovery”?
"Discovery"? Sure. They 'discovered' a good potential way to explain how and why the Earth and the sun stayed in orbit, and the concept of gravity has always been "testable" in controlled experimentation, but actual 'knowledge' is a bit trickier. Experimentation *verified* the 'theory', at which point I'd call it "knowledge".
What is discovery, then? And what was it that Copernicus or Kepler actually did if “discovery” isn't an applicable term to what they concluded in astronomy at those points in time?
I'm comfortable with the term 'discovery', but knowledge is a horse of a different color. The knowledge to verify the discovery came from active experimentation, not just "uncontrolled observation". The observations certainly lead to "insights" and good ideas/theories, but not actual 'knowledge' IMO. Cause/effect 'knowledge' requires a verification of the idea.
Dark matter is a great example of what you might claim is a 'discovery', but the lab results suggest that we know little or nothing about it, assuming it even actually exists at all. PandaX-II and Xenon-1T experiments pretty much destroyed any concept of 'knowledge' associated with the term "dark matter", and many observations suggest that it might be ordinary matter, not exotic matter. The term "missing mass" would have actually been a better "discovery" claim.
Well, that is obvious, but am I to gather that you wouldn't say that Darwin and Huxley, and other scientists, had strong confidence in Darwin's Theory of Evolution as he had articulated? Darwin didn't think it was a form of “truth” or that what he observed on the Galapogos Islands didn't count as knowledge?
He may have had a great idea that did tend to explain the diversity of life and which was consistent with the data he had at the time, but without the "knowledge" of DNA, and it's effect on organisms, what did he really 'know'? There is really no such thing as "truth" or "proof" in science. It's always considered provisional to some degree, but I'd definitely say that we have "knowledge' of DNA, and knowledge about biology in 2017 that has translated into useful consumer products, like antibiotics.
It seems that something here in the meaning of “scientific knowledge” is being obfuscated: are we clear as to what are defined in science as Facts, Hypotheses, Theories and/or Laws?
The terms "dark energy" and "dark matter" have no real "knowledge" associated with them. They are simply placeholder terms for human ignorance. If we had 'knowledge' of these things, astronomers could name a source of dark energy, and they wouldn't have had so many failures at LHC, LUX, PandaX, Xenon-1T, etc. There's no "knowledge' associated with such terms. There is one specific cosmology theory that requires them, but other cosmology theories do not.
Maybe see the video above in post #27 and see if you agree or disagree with the commentators presentation:
Critique on...The Myths of Science
Peace,
2PhiloVoid
I'll check it out and comment after I've seen the video.