Iron weighs more after it rusts.
68
One ragweed plant can release as many as one billion grains of pollen!
51
Most dust particles in your house are made from dead skin!
67
One barrel of petroleum holds 42 gallons.
20
Sound at the right vibration can bore holes through a solid object.
134
Diamonds can be shattered with a hammer.
-104
Every day, plants convert sunlight into energy equivalent to six times the entire power consumption of human civilization.
9
Indoor pollution is 10 times more toxic than outdoor pollution.
62