It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Roughly 90% of the world's population live in the northern hemisphere.
18
Denmark has twice as many pigs as there are people.
66
Every person in the world can fit in Texas and be given over 1000 sq ft in which to live.
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There are approximately three chickens for every human on Earth.
13
Only about 2% of the world population has green eyes.
36
A third of the human population sneezes when they look at the Sun. Light can signal the ocular nerve near the sinuses and triggers a sneeze.
18