Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Cold water weighs more than hot water.
93
If the chemical sodium is dropped into water it will immediately and violently explode.
67