Iron weighs more after it rusts.
68
Nylon is made from coal and petroleum.
42
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Balsa wood is classified as a hard wood!
41
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
Research indicates that plants grow healthier when they are stroked.
173
Cold water weighs more than hot water.
93
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65