Fluid and crystallized intelligence. In psychology, fluid and crystallized intelligence (respectively abbreviated Gf and Gc) are factors of general intelligence, originally identified by Raymond Cattell. Concepts of fluid and crystallized intelligence were further developed by Cattell's student, John L. Horn.
Old Head Golf Links: Ireland's scenic golf treasure in County Cork. Words and pictures don't do justice to Old Head Golf Links.ld Head Golf Links: Ireland's scenic golf treasure in County Cork. Words and pictures don't do justice to Old Head Golf Links.
Because of its honeycomb-like structure, cork consists largely of empty space; its density (weight per unit volume) is one-fourth that of water. Unlike a honeycomb, however, cork consists of irregularly shaped and spaced cells having an average of 14 sides.