Learn more about population: http://ngm.nationalgeographic.com/7-billion ➡ Subscribe: http://bit.ly/NatGeoSubscribe About National Geographic: National Geographic is the world's premium destination for science, exploration, and adventure. Through their world-class scientists, photographers, journalists, and filmmakers, Nat Geo gets you closer to the stories that matter and past the edge of what's possible. Get More National Geographic: Official Site: http://bit.ly/NatGeoOfficialSite Facebook: http://bit.ly/FBNatGeo Twitter: http://bit.ly/NatGeoTwitter Instagram: http://bit.ly/NatGeoInsta To 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 challenges—and potential solutions—for coping with a growing human population in a world of limited resources with informative videos, int