Sound travels fifteen times faster through steel than through air.
134
Balsa wood is classified as a hard wood!
41
Cold water weighs more than hot water.
93
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
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
Pumice is the only rock that floats on water.
14
A cesium atom in an atomic clock beats over nine billion times a second.
43
The earth is approx. 6,588,000,000,000,000,000 tons.
175