The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
For every gallon of sea water, you get more than a quarter pound of salt.
45
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
Sound travels about 4 times faster in water than in air.
408
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
Indoor pollution is 10 times more toxic than outdoor pollution.
62
The banana plant cannot reproduce itself. It can be propagated only by the hand of man.
155