Sound travels fifteen times faster through steel than through air.
134
Aluminum used to be more valuable than gold!
84
The only letter not appearing on the Periodic Table is the letter "J".
180
Most dust particles in your house come from dead skin.
48
If the chemical sodium is dropped into water it will immediately and violently explode.
67
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
44
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39