Sabrina Sholts and Sebastian Wärmländer 's research: tar has always been bad for you.

Originally shared by Crystal Sholts

Sabrina Sholts and Sebastian Wärmländer 's research: tar has always been bad for you.
http://news.nationalgeographic.com/news/2011/10/111006-tar-toxic-pollution-chumash-health-indians-science-heads/

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