Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
104
Yawns are more contagious among people with closer relationships.
163
Men fall in love faster than women do.
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There's an isolated tribe in Zimbabwe where the people have only two toes, dubbed the 'ostrich people'.
10
The world's tallest man reached 8 feet 11 inches at 21.
202
More boys than girls are born during the day; more girls are born at night.
120
Men are more attracted to women whose bone structure is similar to their own mothers. It's called "sexual imprinting".
18