A duck's quack does not echo and no one knows why.
Intelligent people have more copper and zinc in their hair.
The youngest pope was 11 years old. Iceland consumes more Coca-Cola per capita than any other country. In every episode of Seinfeld there is a Superman somewhere. In the 1940s, the FCC assigned television's Channel 1 to mobile The San Francisco Cable cars are the only mobile National Monuments. The only 15-letter word that can be spelled without repeating a letter is uncopyrightable.