Iron weighs more after it rusts.
68
Cold water weighs more than hot water.
93
The earth is approx. 6,588,000,000,000,000,000 tons.
175
One third of the electricity produced on earth is used to power electric light bulbs!
75
Most liquid laundry detergents are alive with living organisms that help to break down stains!
88
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
If the chemical sodium is dropped into water it will immediately and violently explode.
67
Nearly 50% of the world's scientists are assigned to military projects.
71