They relate to discussions here or anywhere else in the same way that they relate to the legal system or theology.
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Evidence: aka data. In science, the stuff that makes up most of the figures and tables. In law, what can be physically examined.
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Hearsay: in science, what someone says or writes about the evidence. In law, testimony about what someone else said, not what someone else did, and generally disallowed as evidence because it is unreliable (even noted in the Bible!). It can be true or false.
Examples:
Did you just read the words, or did you look at any of that data you made a claim about?
There’s nothing to decide!
What anyone says in a video is always hearsay, whether he knows what he’s talking about or not. It doesn’t matter if it is true or false, it doesn’t matter if you agree or disagree, it’s still hearsay and more importantly, misrepresenting it as evidence is simply unethical.
Well, what actual evidence have you actually examined that would actually justify such a claim?