It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Men are more attracted to women whose bone structure is similar to their own mothers. It's called "sexual imprinting".
18
People who have a strong friendship possess the ability to communicate with one another through facial expressions.
46
Every workday, 6.7 million people commute to Manhattan!
26
The single biggest predictor of love is proximity.
30
Every human spent about half an hour as a single cell.
144
The average American consumes 9 pounds of food additives every year.
6
Identical twins do not have identical fingerprints.
79