The bark of an older redwood tree is fireproof.
65
Your brain is 80% water.
525
A cubic yard of air weighs about 2 pounds at sea level.
31
4.5 pounds of sunlight strike the Earth each day.
27
Pure water (H2O) does not conduct electricity on its own.
46
Iron weighs more after it rusts.
68
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61