Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Iron weighs more after it rusts.
16
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Balsa wood is classified as a hard wood!
41
Scientists concluded that the chicken came first, not the egg, because the protein which makes the egg shells is only produced by hens.
11
One barrel of petroleum holds 42 gallons.
20
4.5 pounds of sunlight strike the Earth each day.
27