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they don't have any affect at all on the randomness apparently. as long as one does the von neuman method it doesn't matter about all of those external factors.
just make sure to keep the conditions identical throughout the entire coin flipping process and don't let any of those factors vary. should be a piece of cake.
But if those factors don't affect the flip, wouldn't that mean your second statement should be ignored because it says to keep the conditions identical and those conditions are the factors that I have talked about right? But I guess you're right, it's not like those factors can quickly change unless there's a physical intervention.