09-23-2010, 02:07 PM
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#685
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Come on, cat.
Join Date: Nov 2003
Location: general vicinity of Philadelphia area
Posts: 7,013
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Herd immunity?
City living helped humans evolve immunity to TB
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"Population density seems to play an important role in shaping so many aspects of our species", said Prof Thomas. "It was a vital factor in our species maintaining the complex skills and culture that distinguish us from other primates. It drove many of the genetic differences we see today between different populations from around the world. And now, it seems, it also influenced how infectious diseases spread in the past and how we evolved to resist those diseases".
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__________________
Crying won't help you, praying won't do you no good.
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