On average women can hear better than men.
170
A hard working adult sweats up to 4 gallons per day.
39
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Babies cry but they don't produce tears until one to three months after birth.
238
Most people smile when they are frustrated, according to a study.
15
47% of people have a nightmare at least once a month.
186