Boys who have unusual first names are more likely to have mental problems than boys with conventional names. Girls don't seem to have this problem.
131
There are actually seven different types of twins: Identical, Fraternal, Mirror-Image, Polar Body (Half Identical), Mixed Chromosome, Superfecundation, and Superfetation.
20
Women have a slightly higher average IQ than men.
164
In a year, the average person walks four miles to make his or her bed.
56
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Females learn to talk earlier, use sentences earlier, and learn to read more quickly than males.
119
Two in five people in the world marry their first love.
270
