A cubic yard of air weighs about 2 pounds at sea level.
31
Research indicates that plants grow healthier when they are stroked.
173
The smell of freshly cut grass is actually a plant distress call.
31
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
The earth is approx. 6,588,000,000,000,000,000 tons.
175
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7
4.5 pounds of sunlight strike the Earth each day.
27
