It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Thrity-five percent of the people who use personal ads for dating are already married.
102
People who have a strong friendship possess the ability to communicate with one another through facial expressions.
46
There are actually seven different types of twins: Identical, Fraternal, Mirror-Image, Polar Body (Half Identical), Mixed Chromosome, Superfecundation, and Superfetation.
20
Children grow faster in the springtime than any other season during the year.
108
Awarding people money for doing well in IQ tests causes them to score better, $10 increased people's score by an average of more than 20 IQ points. IQ tests don’t just measure intelligence - they also measure effort.
9
Women who read romance novels have sex twice as often as those who don't.
101
Only 2% of the Earth's population are natural redheads.
13