The offspring of two sets of identical twins are legally cousins but genetically siblings.
63
Only about 2% of the world population has green eyes.
36
Approximately 4 to 5% of the U.S. population has one or more clinically significant phobias in a given year. Specific phobias occur in people of all ages. The average age of onset for social phobia is between 15 and 20 years of age, although it can often begin in childhood.
30
Females learn to talk earlier, use sentences earlier, and learn to read more quickly than males.
119
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
Every human spent about half an hour as a single cell.
144
8 out of 10 people think that the first kiss indicates how the rest of the relationship will be.
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