The Eisenhower interstate system requires that one mile in every five must be straight. These straight sections are usable as airstips in times of war or other emergencies. Emus cannot walk backwards. There are only thirteen blimps in the world. Nine of the thirteen blimps are in the United States.
Cats have over one hundred vocal sounds, while dogs only have about ten.
Our eyes are always the same size from birth, but our nose and ears never stop growing. Most hamsters only blink one eye at a time. In every episode of Seinfeld there is a Superman somewhere. G.P. Murphy's Oil Soap is the chemical most commonly used to clean elephants. Since 1896, the beginning of the modern Olympics, only Greece and Australia have participated in every Olympics.