Check link này xem bạn là đứa thứ bao nhiêu trên trái đất nhé 
http://www.bbc.co.uk/news/world-15391515
My result
You are 20, female and living in Vietnam
You were the 5,360,123,657th person
Vietnam
Your country's population is 87,848,445
Average life expectancy is 76.2 years
What's next? The global population will continue to increase during your lifetime, reaching 10 billion by 2083. However, the rate of growth is expected to slow. Most of the current growth is happening within your group of countries, or the developing world.
Young people: The world's population is young, like you. Under-25s make up 43% of the global population, but they make up 60% of the world's least-developed countries. Birth rates and death rates are declining in your group of nations. Women now have an average of 2.5 children.
Battle for resources: It is estimated that the richest group of countries consumes double the resources used by other areas of the world - including yours. The UN estimates that if current population and consumption trends continue, by the 2030s we will need the equivalent of two Earths to support us.
Did you know? A mother with five years of schooling increases her children's chances of surviving past the age of five by 40%.
626 people
the amount the population has grown while you've been on this site
Source: bbc news
http://www.bbc.co.uk/news/world-15391515
My result
You are 20, female and living in Vietnam
You were the 5,360,123,657th person
Vietnam
Your country's population is 87,848,445
Average life expectancy is 76.2 years
What's next? The global population will continue to increase during your lifetime, reaching 10 billion by 2083. However, the rate of growth is expected to slow. Most of the current growth is happening within your group of countries, or the developing world.
Young people: The world's population is young, like you. Under-25s make up 43% of the global population, but they make up 60% of the world's least-developed countries. Birth rates and death rates are declining in your group of nations. Women now have an average of 2.5 children.
Battle for resources: It is estimated that the richest group of countries consumes double the resources used by other areas of the world - including yours. The UN estimates that if current population and consumption trends continue, by the 2030s we will need the equivalent of two Earths to support us.
Did you know? A mother with five years of schooling increases her children's chances of surviving past the age of five by 40%.
626 people
the amount the population has grown while you've been on this site
Source: bbc news