One 75-watt bulb gives more light than three 25-watt bulbs.
57
There are more atoms in one teaspoon of water than there are teaspoons of water in the Atlantic Ocean.
13
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
Each day, up to 150 species of life become extinct.
-23
Pumice is the only rock that floats on water.
14
Most dust particles in your house are made from dead skin!
67
A ball of glass will bounce higher than a ball made of rubber.
73