Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
One barrel of petroleum holds 42 gallons.
20
The gas that gives rotten eggs their distinctive foul smell may slow ageing and block damaging chemical reactions inside cells, according to scientists in China.
5
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Iron weighs more after it rusts.
16
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18