The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Pure water (H2O) does not conduct electricity on its own.
46
The bark of an older redwood tree is fireproof.
65
In 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
39
No matter how cold it gets, gasoline will not freeze.
107
Aluminum used to be more valuable than gold!
84
Most dust particles in your house come from dead skin.
48
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75