Brass doorknobs automatically disinfect themselves in about 8 hours.
18
The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
Sound travels about 4 times faster in water than in air.
408
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
There are more atoms in one teaspoon of water than there are teaspoons of water in the Atlantic Ocean.
13