Iron weighs more after it rusts.
68
German chemists made a replica of a trophy the size of one molecule.
68
Cold water weighs more than hot water.
93
4.5 pounds of sunlight strike the Earth each day.
27
The bark of an older redwood tree is fireproof.
65
If the chemical sodium is dropped into water it will immediately and violently explode.
67
Indoor pollution is 10 times more toxic than outdoor pollution.
62
The average home creates more pollution than does the average car.
33