Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7
Most dust particles in your house come from dead skin.
48
The bark of an older redwood tree is fireproof.
65
The banana plant cannot reproduce itself. It can be propagated only by the hand of man.
155
One third of the electricity produced on earth is used to power electric light bulbs!
75
One gallon of used motor oil can ruin approximately one million gallons of fresh water!
71
Sound travels fifteen times faster through steel than through air.
134