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Sorry to pull you up twice in the same thread, but what's your source for this information? I could only find a dubious Yahoo! Answers thread about it, and nothing in the scientific literature. I highly doubt this is true, since almost all the negative prejudices about RH- blood group come from David Icke's stupid 'reptilian' paranoid conspiracy (warning, the link points to one of the most misguided communities on the internet).

Look I"m not a scientiest, I just read a lot. I'm fully aware that a great deal of that may be total BS. The reason I even came across that info on the extra rib, over and over actually and from some of my FB friends, is that I was looking up some of my own issues. I have really low blood pressure and low body temp, I came across the link with Rh- people and I am. Then I read some of the other common traits and I had others. I don't' have an extra rib that I know of and my hands were too cold to count, but I do have extra roots in all my teeth. So I thought it was interesting and passed it along. It's just for fun. I slink away to happier forums.

Despite (misplaced) popular opinion, dozens of large scale studies and meta analyses have concluded that there is no evidence of long term mobile phone use being associated with an increased risk of disease, including brain cancers, or mutations.

I disagree with that and so does the world health organization:

http://www.naturalnews.com/028379_cell_phones_brain_tumors.html

People with Rh- blood typically have an extra rib.