On average a woman has 4 sexual partners in her lifetime.
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You can only remember 4 things at a time.
31
A man is more likely to get a woman's phone number if he is accompanied by a dog.
20
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
One in 500 humans has one blue eye and one brown eye.
145