Nearly half of the entire world's adult population has never drunk alcohol.
12
There are approximately three chickens for every human on Earth.
13
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
Every person in the world can fit in Texas and be given over 1000 sq ft in which to live.
14
Roughly 90% of the world's population live in the northern hemisphere.
18
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Only about 2% of the world population has green eyes.
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