~ Mudi, Sloughi, Xoloitzcuintli, and Leonberger are dog breeds - all officially recognized by the American Kennel Club.
~ The Cannonball Express was the name of the train that ill-fated railroad engineer Casey Jones was operating when it crashed.
~ Armstrong's Line is a high-altitude flight term. It is the point - about 63,000 feet above earth - at which atmospheric pressure is so low that a person's blood would begin to boil if he or she were not wearing a pressurized flight suit. It is named for Harry Armstrong, the Air Force doctor who discovered it.