Indoor pollution is 10 times more toxic than outdoor pollution.
62
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
The sun is 330,330 times larger than the earth.
75
Pure water (H2O) does not conduct electricity on its own.
46
The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
The average temperature at 40,000 feet above sea level is -60 F.
56