If the chemical sodium is dropped into water it will immediately and violently explode.
67
There are more atoms in one teaspoon of water than there are teaspoons of water in the Atlantic Ocean.
13
Iron weighs more after it rusts.
68
Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
9
Pumice is the only rock that floats on water.
14
Nylon is made from coal and petroleum.
42
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39