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Spirit bird explained it really well.
You will find a lot of stuff written about RH negative blood types online. But some of it is very way-out, I think
Being RH negative means that the blood doesn't contain the rhesus factor, which the majority of the population have.
So there is a (possibly dubious?) theory that these people did not originate from planet Earth....
There will be an explanation for this. Meanwhile peoples' imaginations have a field-day with it! And it results in hundreds of articles, videos etc about these "blue bloods" with rather odd theories and stereotypes.
I think the less I say about it all, the better!
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