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Yeah, it only took 30,000 years of human development, the sharing of ideas from hundreds of cultures, and countless deaths to discover that fecal traces could cause dysentery. Don't assume that it's obvious because its already part of our common understanding of the world. There are still people in the world who discount the connection, and die because of it.
But, this isolated group probably figured it out all on their own. Of course WE DONT KNOW THAT, BECAUSE WE REFUSE TO SHARE OUR KNOWLEDGE WITH THEM.
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