The earth is approx. 6,588,000,000,000,000,000 tons.
175
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
Pumice is the only rock that floats on water.
14
The average temperature at 40,000 feet above sea level is -60 F.
56
Every day, plants convert sunlight into energy equivalent to six times the entire power consumption of human civilization.
9
Pure water (H2O) does not conduct electricity on its own.
46
The average home creates more pollution than does the average car.
33