Population is based on the de facto definition of population, which counts all residents regardless of legal status or citizenship--except for refugees not permanently settled in the country of asylum, who are generally considered part of the population of their country of origin.
The brain is made up of over 100 billion nerve cells with each brain cell connected to around 10,000 other cells, which equals around 1000 trillion connections in your brain. Your brain is actually very soft, jelly-like, and not grey but a deep red in color. The brain controls both involuntary, or lower, actions, such as heart rate, respiration, and digestion. Complex, or higher, mental activity, such as thought, reason, and abstraction, is consciously controlled.
Normally the whites of eyes or sclera are white in color. One can get yellow sclera, a condition also called scleral icterus, which is caused by an elevation of bilirubin in the bloodstream. Bilirubin is made in the liver and is yellow in color. If a person suffers from liver disease, the liver can no longer process the breakdown of red blood cells and bilirubin, its natural metabolic product, no longer enters the bile and instead builds up in the blood and tissues, including the sclera of the eyes.