A study dating the age of more than 1 million single-letter variations in the human DNA code reveals that most of these mutations are of recent origin, evolutionarily speaking. (2012-11-29)
URL: http://www.brightsurf.com/news/headlines/81327/Most_of_the_harmful_mutations_in_people_arose_in_the_past_5000_to_10000_years.html
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