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    Are there any good viruses for human beings?

    Cool. I wonder if any other components to the human body evolved from a virus or bacteria? White blood cells maybe?
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    Are there any good viruses for human beings?

    I've wondered about this myself.. Going by evolution logic, wouldn't it make more sense if a virus actually was beneficial to the body it lives in? That way the virus could be easily spread to other hosts over a longer period (since it would make the host live longer on average)...
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    O2 levels in lower atmosphere

    Are O2 levels dropping in our atmosphere? I read something a while ago that mentioned allergies are getting worse due to increasing CO2 levels in atmosphere, so I'm guessing O2 levels are dropping as well. I was in the mountains a week ago (out of a valley), and noticed how easier it is to...
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