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There's a lot of evidence to suggest most of her research was fraudulent

I wonder how much of it was just a https://en.wikipedia.org/wiki/Clever_Hans situation

And at least in Hans' case, the general public could instantly verify the result, as opposed to having it interpreted by a biased handler.

Almost all of it was exactly this.

That's why it's never been done again. Because it was never done in the first place.