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.
The tree has a life span of 250-350 years. Each cork tree must be 20 to 25 years old before it can provide its first harvest of cork bark. This cork is known as virgin and has a hard and irregular structure.