About the Author

National Geographic Societyis one of the largest nonprofit scientific and educational organizations in the world. Founded in 1888, it reaches more than 285 million people worldwide each month through its official journal, National Geographic, and its four other magazines, as well as the National Geographic Channel, television documentaries, radio programs, films, books, maps, and interactive media. National Geographic has funded more than 8,000 scientific research projects and supports an education program combating geographic illiteracy.