It looks like according to two sources, James Randi yes the amazing Randi has back out of an challenge with an homeopath. This doesn't surprise me, i don't think it would surprise James Randi's fans either they will just say it isn't James Randi duty to take up all challenges. Well ok, he chooses the ones he wants to take up, isn't that bias?.
Here are the sources
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Lost in the bardo
3 weeks ago