Because it has been explained extensively to you every time you start spamming threads with it.
Spare us your feigned innocence.
Who asked you that?
Feigned indignation now? You know exactly what will happen when you post this"proof" schtick of yours, you've done it so many times.
Meh, I feel a bit sorry for you, given your inability to understand such a simple concept, or alternatively that you need to feign ignorance of that concept to derail threads.
For the record, here are few few responses you've received to your "proof" thing in the past.
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"The hardest part about understanding scientific theories and hypotheses seems to be this: a hypothesis is never proven correct, nor is a theory ever proven to be true. Words like
prove,
correct, and
true should be removed from our vocabulary completely and immediately."
"One source of confusion about the status of the science or theory of evolution stems from the difference between the "everyday" meaning of the word "theory" and the scientific meaning the word.
Below we list some common misconceptions about the term "theory" and describe a classroom activity that can help students rethink their understanding of this term.
NSTA News
(The National Science Teachers Association)
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Misconception 1 "Evolution is 'just a theory'".
Misconception 2 "Theories become facts when they are well supported and/or proven."
There are three important misconceptions propagated in the above statements. The first statement implies that a theory should be interpreted as just a guess or a hunch, whereas in science, the term theory is used very differently. The second statement implies that theories become facts, in some sort of linear progression. In science, theories never become facts. Rather, theories explain facts. The third misconception is that scientific research provides proof in the sense of attaining the absolute truth. Scientific knowledge is always tentative and subject to revision should new evidence come to light."
https://ncse.com/library-resource/theory-
(National Centre for Science Education)
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One of the most common misconceptions concerns the so-called “scientific proofs.” Contrary to popular belief, there is no such thing as a scientific proof.
Proofs exist only in mathematics and logic, not in science. Mathematics and logic are both closed, self-contained systems of propositions, whereas science is empirical and deals with nature as it exists. The primary criterion and standard of evaluation of scientific theory is evidence, not proof. All else equal (such as internal logical consistency and parsimony), scientists prefer theories for which there is more and better evidence to theories for which there is less and worse evidence. Proofs are not the currency of science.
Proofs have two features that do not exist in science: They are final, and they are binary. Once a theorem is proven, it will forever be true and there will be nothing in the future that will threaten its status as a proven theorem (unless a flaw is discovered in the proof). Apart from a discovery of an error, a proven theorem will forever and always be a proven theorem.
In contrast, all scientific knowledge is tentative and provisional, and nothing is final. There is no such thing as final proven knowledge in science. The currently accepted theory of a phenomenon is simply the best explanation for it among all available alternatives. Its status as the accepted theory is contingent on what other theories are available and might suddenly change tomorrow if there appears a better theory or new evidence that might challenge the accepted theory. No knowledge or theory (which embodies scientific knowledge) is final. That, by the way, is why science is so much fun.
Common misconceptions about science I: “Scientific proof”
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"No amount of experimentation can ever prove me right;
a single experiment can prove me wrong."
Albert Einstein
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Karl Popper -
"In the empirical sciences, which alone can furnish us with information about the world we live in, proofs do not occur, if we mean by 'proof' an argument which establishes once and for ever the truth of a theory".
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Jack Fraser, Master's Physics, University of Oxford -
“Proof” implies that there is no room for error — that you can be 100% sure that what you have written down on the piece of paper is 100% representative of what you are talking about."
And quite simply, that doesn’t exist in the real world.
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National Science Foundation
Journalists often write about "scientific proof" and some scientists talk about it, but in fact, the concept of proof — real, absolute proof — is not particularly scientific. Science is based on the principle that any idea, no matter how widely accepted today, could be overturned tomorrow if the evidence warranted it. Science accepts or rejects ideas based on the evidence; it does not prove or disprove them.
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ME:
As for "appealing to credentials", they are just a few examples. On the one hand we've got
everyone involved with science and
every scientific institute/centre in the world saying that they don't deal with proof, that theories are never proven, and one the other hand we've got a laymen on the internet insisting the opposite. Get real.