The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
Sound at the right vibration can bore holes through a solid object.
134
Sound travels about 4 times faster in water than in air.
408
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
Nylon is made from coal and petroleum.
42
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
A cubic yard of air weighs about 2 pounds at sea level.
31
If the chemical sodium is dropped into water it will immediately and violently explode.
67