Iron weighs more after it rusts.
68
A cesium atom in an atomic clock beats over nine billion times a second.
43
Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
9
The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116
One 75-watt bulb gives more light than three 25-watt bulbs.
57
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89