Pumice is the only rock that floats on water.
14
A cubic yard of air weighs about 2 pounds at sea level.
31
Hot water can freeze faster than cold water.
181
Liquid TIDE laundry detergent glows under a blacklight.
96
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
A cesium atom in an atomic clock beats over nine billion times a second.
43
The average home creates more pollution than does the average car.
33
German chemists made a replica of a trophy the size of one molecule.
68