At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
Indoor pollution is 10 times more toxic than outdoor pollution.
62
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
Nearly 50% of the world's scientists are assigned to military projects.
71
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
One 75-watt bulb gives more light than three 25-watt bulbs.
57
Hot water can freeze faster than cold water.
181