When estimating the cost for a project, product or other item or investment, there is always uncertainty as to the precise content of all items in the estimate, how work will be performed, what work conditions will be like when the project is executed and so on. These uncertainties are risks to the project.Some refer to these risks as known-unknowns because the estimator is aware of them, and based on past experience, can even estimate their probable costs. The estimated costs of the known-unknowns is referred to by cost estimators as cost contingency.hese uncertainties are risks to the project. Some refer to these risks as known-unknowns because the estimator is aware of them, and based on past experience, can even estimate their probable costs. The estimated costs of the known-unknowns is referred to by cost estimators as cost contingency.
In Europe, the Nordic countries have a sauna tradition. The Finnish sauna culture is well established, there are built-in-saunas in almost every house in Finland. The oldest known saunas in Finland were made from pits dug in a slope in the ground and primarily used as dwellings in winter.
Expert: M. Castillo replied 10 years ago. Hello, and thank you for a great question. Tap dancing originated in the United States of America in the 19th century. From what is known, tap dance may have begun in the 1830s in the Five Points neighborhood of New York City as a fusion of Irish and African Shuffle. Perhaps the most influential of all was the Irish jig. Dancers from different immigrant groups would get together to compete and show off their best moves. As the dances fused, a new American style of dancing emerged. Source: wikipedia.com You can read more about it here. If you find this information to be helpful, please kindly click the Accept button.