Yu Youzhen, a Chinese millionaire, works as a street sweeper for the sanitation department to set an example for her children.
11
Most people smile when they are frustrated, according to a study.
15
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
47% of people have a nightmare at least once a month.
186
In 2002, Kenyan Maasai tribespeople donated 14 cows to the US to help with the aftermath of 9/11.
22
You will experience the billionth second of your life when you are 31 years old.
21