Iron weighs more after it rusts.
68
Iron weighs more after it rusts.
16
A cubic yard of air weighs about 2 pounds at sea level.
31
Columbia University has developed an artificial tree that passively soaks up carbon dioxide from the air using "leaves" that are 1,000 times more efficient than true leaves that use photosynthesis.
15
Each day is longer than the previous on by 0.00000002 seconds which is 13 seconds each century!
116
One gallon of used motor oil can ruin approximately one million gallons of fresh water!
71
The average home creates more pollution than does the average car.
33
Pure water (H2O) does not conduct electricity on its own.
46