Re: upsetting a lot of the other jurors.
@JetSetJim -- Thank you. When I saw the reply I dithered about answering, because as always there are at least two sides, and a bit of "Chesterton's Fence" involved.
Again: IANAL!
Not only is any _one_ trial supposed to depend strictly on the evidence, any appeal will depend on the record of that evidence, so "replicating the results" can be problematic. _way_ deeper in the law than I will ever get, but I believe there are ways to deal with juror misconduct.
That said, one big source of inability to replicate conditions is the scene from _so_ many courtroom dramas, where one lawyer will make some outrageous "statement disguised as a question", the opposing one will object, and the judge will sustain and say something along the lines of striking from the record, and instructing the jury to disregard. Yeah, right.
That bell can't really be un-rung, and if there is a retrial, one could _hope_ that the particular incident would not be repeated. But I have no idea whether such entries are completely stricken, so to speak. If the same lawyers appear before a different judge, who is unaware of the previous stunt, the record in the minds of the jurors may be similarly affected as in to the original. But appearing before the same judge, or one with access to an unredacted record, might take an alternate path.
All this to say the law is complex because it tries to be able to account for and deal with a huge variety of behavior and information by prescribing rules ahead of time about what to do.
This is a mug's game similar to programming. As with programming, a lot depends on skill, good-will, and judgement.
BTW: I know of at least two cases where an expert witness lied, so it's not just jurors who might. These case were in civil cases among tech companies, and were settled and sealed (can't take the chance of establishing a precedent that could bite you later, or outraging the customers or regulators), and of course _had_ they gotten to the verdict it would be to a lower standard of proof than a criminal case
(In the U.S. Third time: IANAL)