A cubic yard of air weighs about 2 pounds at sea level.
31
Out of all the senses, smell is most closely linked to memory.
146
Balsa wood is classified as a hard wood!
41
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
One third of the electricity produced on earth is used to power electric light bulbs!
75
One ragweed plant can release as many as one billion grains of pollen!
51
One gallon of used motor oil can ruin approximately one million gallons of fresh water!
71
One cubic foot of gold weighs more than 1,200 pounds!
78