30 October 2011 Updated at 20:03 ET
Are there really seven billion of us?
Rema Rahman
BBC News
In today's MagazineThe rise of the Halloween haunted house
Should shipwrecks be left alone?
The myth of the War of the Worlds panic
The only living master of a dying martial art
The United Nations estimates that on Monday 31
October the world's population will reach seven billion. But how accurate is this figure?
link-
http://www.bbc.co.uk/news/magazine-15494349