It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
People in parts of Western China put salt in their tea instead of sugar.
16
In a lifetime, an average person walks the equivalent of 5 equators
177
A hard working adult sweats up to 4 gallons per day.
39
Yawns are more contagious among people with closer relationships.
163
Forty percent of American adults cannot fill out a bank deposit slip correctly.
155
2% of Europeans lack the genes for smelly armpits.
6
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15