Part of the Operating systems glossary: Mac OS is the computer operating system for Apple Computer's Macintosh line of personal computers and workstations. A popular feature of its latest version, Mac OS X, is a desktop interface with some 3-D appearance characteristics.
The Preakness Stakes is an American flat thoroughbred horse race held on the third Saturday in May each year at Pimlico Race Course in Baltimore, Maryland. It is a Grade I race run over a distance of 9.5 furlongs (13â16 miles (1,900 m)) on dirt.
The Grand National. The Grand National is a National Hunt horse race held annually at Aintree Racecourse, near Liverpool, England. It is a handicap steeplechase over 4 miles 3Â½ furlongs, with horses jumping 30 fences over two circuits.