The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
According to studies, men change their minds two to three times more often than women.
72
In 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
39
One cubic foot of gold weighs more than 1,200 pounds!
78
Most dust particles in your house are made from dead skin!
67
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101