About 2/3 of American men prefer boxers to briefs.
83
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
Yawns are more contagious among people with closer relationships.
163
There are actually seven different types of twins: Identical, Fraternal, Mirror-Image, Polar Body (Half Identical), Mixed Chromosome, Superfecundation, and Superfetation.
20
According to CNN national security correspondent David Ensore, as of 2002 bin Laden had married four women and fathered roughly 25 or 26 children.
54
Men are more attracted to women whose bone structure is similar to their own mothers. It's called "sexual imprinting".
18
You can only remember 4 things at a time.
31
Americans will spend more on cat food this year than baby food.
32