A cubic yard of air weighs about 2 pounds at sea level.
31
One gallon of used motor oil can ruin approximately one million gallons of fresh water!
71
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Neanderthal man had a brain capacity 100cc larger than modern man's.
50
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
Sound travels about 4 times faster in water than in air.
408
The earth is approx. 6,588,000,000,000,000,000 tons.
175