It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Although African-Americans make up only 13% of the U.S. population, they accounted for one half of the estimated new HIV/AIDS diagnoses in 2004.
70
Only about 2% of the world population has green eyes.
36
Denmark has twice as many pigs as there are people.
66
Roughly 90% of the world's population live in the northern hemisphere.
18
There are approximately three chickens for every human on Earth.
13
Nearly half of the entire world's adult population has never drunk alcohol.
12