Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
Your brain is 80% water.
525
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
44
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
A cubic yard of air weighs about 2 pounds at sea level.
31
Sound at the right vibration can bore holes through a solid object.
134
Iron weighs more after it rusts.
68
