Usually the endowment is structured so that the principal amount is kept intact while the investment income is available for use, or part of the principal is released each year, which allows for their donation to have an impact over a longer period than if it were spent all at once.
Cabot, Arkansas. Cabot is the largest city in Lonoke County, Arkansas, United States and a suburb of Little Rock. According to 2010 U.S. Census Bureau estimates, the population of the city is 23,776, ranking it as the state's 20th largest city, behind Paragould.
According to the 2011 census, its population was 1,695 (953 males, 742 females, including 275 indigenous Australians). The town is sometimes referred to as the opal capital of the world because of the quantity of precious opals that are mined there. Coober Pedy is renowned for its below-ground residences, called  dugouts , which are built in this fashion due to the scorching daytime heat.