Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
The banana plant cannot reproduce itself. It can be propagated only by the hand of man.
155
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7
A cesium atom in an atomic clock beats over nine billion times a second.
43
Sound at the right vibration can bore holes through a solid object.
134
Sound travels fifteen times faster through steel than through air.
134