Brass doorknobs automatically disinfect themselves in about 8 hours.
18
One cubic foot of gold weighs more than 1,200 pounds!
78
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
For every gallon of sea water, you get more than a quarter pound of salt.
45
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Research indicates that plants grow healthier when they are stroked.
173
Sound travels about 4 times faster in water than in air.
408