Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Cold water weighs more than hot water.
93
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3
The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116
No matter how cold it gets, gasoline will not freeze.
107
Iron weighs more after it rusts.
68