Sound travels about 4 times faster in water than in air.
408
Aluminum used to be more valuable than gold!
84
Balsa wood is classified as a hard wood!
41
Nylon is made from coal and petroleum.
42
Diamonds can be shattered with a hammer.
-104
For every gallon of sea water, you get more than a quarter pound of salt.
45
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61