Gloucestershire Old Spots Gloucestershire Old Spots The Gloucestershire Old Spots (also "Gloucester, Gloucester Old Spot, Gloucestershire Old Spot" or simply "Old Spots") is an English breed of pig which is predominantly white with black spots. It is named after the county of Gloucestershire. The Gloucestershire Old Spots pig is known for its docility, intelligence, and prolificity. Boars reach a mature weight of 600 lb (272 kg) and sows 500 lb (227 kg). The pigs are white with clearly defined black (not blue) spots. There must be at least one spot on the body to be accepted in the registry. The breed's maternal skills
Dynamical billiards Dynamical billiards A billiard is a dynamical system in which a particle alternates between motion in a straight line and specular reflections from a boundary. When the particle hits the boundary it reflects from it without loss of speed. Billiard dynamical systems are Hamiltonian idealizations of the game of billiards, but where the region contained by the boundary can have shapes other than rectangular and even be multidimensional. Dynamical billiards may also be studied on non-Euclidean geometries; indeed, the very first studies of billiards established their ergodic motion on surfaces of constant negative curvature. The study of billiards which are