Knowledge falls into two categories.
The deductive where the conclusion is a necessary consequence of the premise, as a bachelor is an unmarried man or even better 2+2=4 and
the experiential - I can see a black thing in the sky.
Philosophically knowledge of an experience only counts whilst having the experience as memory is considered unreliable. There is a famous example of the philosopher giving evidence in a court case who couldn't be sure the traffic light was on red. His concept of certainty was different to the courts and he wouldn't confirm that the light was red, only that he thought the light probably was red though not for certain.
These two strands of knowledge are what give rise to our ideas and theories.
There are two strands of philosophy concerning scientific knowledge. The verificationists consider that any statement must be able to be verified. So any mention of a parallel world is unacceptable because we cannot verify it with our senses. Falsificationists on the other hand insist that any scientific statement should be falsifiable. i.e. that the claim can be tested and falsified in some way.
The link to facts and laws comes through theory. We can accumulate facts and the task is to explain facts using some law. That law is our theory. So if I notice that my coffee cup has disappeared from my desk I can use the scientific law "when my girlfriend moves the coffee cup it will no longer be there."
This explains the fact of my cups disappearance. Though this 'girlfriend law' is a law of nature, it is not one used much because it is subsumed under Newtons law that a body remains at rest until acted on by another body. So laws often encapsulate many other laws into a class.
Laws are only ever theoretical. A law will never be considered to be true. They always stated in such a way that some future evidence may prove the law to be false.
Opinion as to the truth of a law is often divided. Someone who thinks a law is revealing some truth about a feature of the universe would be known as a realist. Someone who thought a law was a good approximation... or who thought the law was just lucky in being able to explain things would be an anti-realist or even an instrumentalist.
Anti-realists can be anti-realist about theories or entities. So not believing in electrons is acceptable. The idea is that the electron does not actually exist, but the theory of electrons does explain the phenomena even though it is not true. Anti-realists are more common than you would think.


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