7 Billion, National Geographic Magazine
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Learn more about population: coincide with the arrival of the world's 7 billionth person on October 31, 2011, National Geographic magazine's 2011 year-long series on world population is available on the App Store as a free app for iPad starting 10/27/11. The interactive app explores the challengesand potential solutionsfor coping with a growing human population in a world of limited resources with informative videos, interactive maps, in-depth articles, and stunning photography. Download the free app here: series ends with a look at City Solutions in the December 2011 issue, which will be incorporated into the app in December. Don't forget to check out the second video from the series, "Are You Typical?," here: 's update: in 2050, 70% of the population will be living in "urban areas," not "megacities" as stated in an earlier version of this video. In addition, the total number of countries in the world is now 195, with recognition of the independence of the Republic of South Sudan on July 9, 2011.