Iron weighs more after it rusts.
16
Balsa wood is classified as a hard wood!
41
Pumice is the only rock that floats on water.
14
Pure water (H2O) does not conduct electricity on its own.
46
Indoor pollution is 10 times more toxic than outdoor pollution.
62
Diamonds can be shattered with a hammer.
-104
MIT has developed a camera that captures the speed of light at a trillion frames per second.
20
The bark of an older redwood tree is fireproof.
65