Just recently a child was born that became the seven-billionth person in the world....seven billion!!! The folks at National Geographic Magazine put together a slick video explaining what it all means and how we got there. The video is called, 'World Population: A National Geographic Tour'. The video helps put a lot of things in perspective like, how many people are born and die every second of every day. It also examines the average human lifespan and sheds light on the increasing numbers of mega cities. Watch this fascinating video below.