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
Scientists in Germany have developed a candy that doesn't cause cavities.
11
One 75-watt bulb gives more light than three 25-watt bulbs.
57
A cesium atom in an atomic clock beats over nine billion times a second.
43
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Scientists concluded that the chicken came first, not the egg, because the protein which makes the egg shells is only produced by hens.
11
