The BBC News website's guide, 7 billion people and you: What's your number?, which attempted to explain how each individual fitted into the history of human life on earth, has been enormously popular.
As a result, we have received hundreds of emails asking a range of questions. Here are the answers to some of the most popular.
Where did you get the information from?
How did you calculate people's individual numbers?
Why isn't my country included?
Where is the information on Kashmir?
Why doesn't it show emigration as well as immigration?
Why is Qatar shown as the fastest-growing nation when my country increases by more people per year?
Does the BBC store people's results?
