A goldfish has a memory span of three seconds. The letters KGB stand for Komitet Gosudarstvennoy Bezopasnosti. Stewardesses' is the longest word that is typed with only the left hand. The only 15 letter word that can be spelled without repeating a letter is uncopyrightable. Emus and kangaroos cannot walk backwards, and are on the Australian coat of arms for that reason.
Cats have over one hundred vocal sounds, while dogs only have about ten.
The reason firehouses have circular stairways is from the days of lore when the engines were pulled by horses. The horses were stabled on the ground floor and figured out how to walk up straight staircases.