Polycythemia Vera. This slow-developing disease occurs when bone marrow produces too many red blood cells, which can lead to thickening of the blood. The condition is thought to be caused in part by a mutation in a gene called JAK2, which regulates the production of various types of blood cells, keeping them in proper balance.
Hilly landscapes and cathedrals dominate much of Andalusia, Spain. The Iberian Peninsula, predominately occupied by the European countries of Spain and Portugal, lies in southwestern Europe. With an area of 582,000 square kilometers, its is the third largest peninsula in the continent.
Spain is one of the largest countries in all of Europe, occupying most of the Iberian Peninsula. Vacation-goers flock to Spain for the sunny beaches along the Mediterranean Sea to the south and the Atlantic Coast to the north, but there's much more to discover if you take the time to look.