aluminum
My parents still believe this !!!
I think in my parent's case "new light" really isn't "new light" it's just a form of "theocratic warfare" meant to "weed out" the "faithful" from the "unfaithful," but the original belief still stands as "truth" in their mind.
I believe they still think it's a conspiracy of the greedy aluminum pot makers of the world that has hidden the true facts that aluminum causes physical/mental ailments, because the WTS can NEVER be wrong...
It's all so freakin' convoluted!
Not to mention the look of shock I had on my face as my parent's told me I should buy white eggs rather than the brown free-run eggs I had been buying, because brown ones seemed to have more of those blood spots in them! Crazy, crazy, crazy!
Rose