Somehow in the 21st century there are still people who believe that the Earth is flat. I'm not sure how this is possible, but the Internet has given "flat-earthers" a platform to share their unusual theories and beliefs. In this video, National Geographic takes us inside the strange arguments between these two diametrically opposed views of our planet, with the hopes of not only explaining it to the rest of us, but also putting the controversy to rest once and for all.
