Depression is not only a state of mood but a behaviour, which is a negative reaction of the human psychics to some problems and bad environment. Negative environment is represented by problems with relatives, divorce, serious disease, financial problems, lost of a close person or a job. Depression is an very widespread phenomenon in the modern society, because people are always hurrying and living in constant stress. No wonder, psychics of most people can not stand it any more and numerous nervous problems occur. Depression can be recognized by a typical behaviour, like low mood, irritation, helplessness, lack of energy, disability to fall asleep; people are always crying and emotionally…

Atack, Jeremy; Bateman, Fred; Weiss, Thomas “The Regional Diffusion and Adoption of the Steam Engine in American Manufacturing.” The Journal of Economic History, Vol. 40, No. 2. (Jun. 1980): 281-308. By 1900 almost 156,000 steam engines were used in factories. This is where the steam engine first gained popularity. The article also discusses the spread of the steam engine for various uses, one of which became known as the steamboat. In spite of the importance accorded the steam engine during nineteenth-century industrialization, little is known about its rate of diffusion in the United States. Another purpose of this paper is to enhance our knowledge about the spread of this technology.…