The offspring of two sets of identical twins are legally cousins but genetically siblings.
63
Research has determined that most people are happiest at 7:26pm on a Saturday night.
69
Roughly a quarter of the world's people live in China.
50
In 2005, 25 percent of Americans over the age of 50 played video games, an increase from nine percent in 1999.
82
Humans are capable of running 40 mph according to a study by bio-mechanical expert Dr. Matthew Bundle. Today's fastest man, Usain Bolt, has a top speed of 28 mph.
34
Women mature much faster than men.
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The world's shortest man measures only 21.5 inches.
73
Most people smile when they are frustrated, according to a study.
15