Quiz: Population 7 Billion—Could We All Fit in One City?
Could all humans fit in one city? Is the most typical person a woman? Get answers in our quiz on the human population reaching seven billion.
(Related: See pictures of Earth's seven billion people.)
(Download National Geographic's 7 Billion iPad app.)
According to statistics, a 28-year-old Han Chinese male is now the most typical human on the planet. The world's largest age bracket is 28, the largest ethnic group is Han, the most populous nation is China, and there are 1.01 men in the world for every woman.
Standing shoulder-to-shoulder, the entire world's population could fit within the 500 square miles (1,300 square kilometers) of Los Angeles.
A typical life in an industrialized country is now about 80 years long—three decades longer than it was a century ago. In contrast, life expectancy in sub-Saharan Africa is a mere 53 years.
It's estimated
