Your kidneys are complex organs. They regulate the amount of water lost from the body and get rid of waste products, especially urea. Urea is made when any excess amino acids are broken down in your liver.
Middle Class Income for a Family. The annual average income for a middle class family of four is approximately $70, 354. This is based on a 2006 report by the U.S. Census for a family of four. This figure is in the middle of the range of incomes for this section of the population. The median income during this time for all households was $48,561.
He suggests defining the middle class as everyone with incomes 50% lower to 50% higher than the median â that is, between 50% and 150% of the median income. Under this rule, a middle-class household could make anywhere from $26,829 to $80,485.