Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
Iron weighs more after it rusts.
68
The banana plant cannot reproduce itself. It can be propagated only by the hand of man.
155
The smell of freshly cut grass is actually a plant distress call.
31
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3
The bark of an older redwood tree is fireproof.
65
Indoor pollution is 10 times more toxic than outdoor pollution.
62