Pittsburgh is a city in the state of Pennsylvania in the United States and the county seat of Allegheny County. The city developed as a vital link of the Atlantic coast and Midwest, as the mineral-rich Allegheny Mountains led to the region being contested by the French and British empires, Virginians, Whiskey Rebels, and Civil War raiders. Pittsburgh has transformed into a hub for the health care, education, and technology industries. Pittsburgh is […]
Sanitation refers to public health conditions related to clean drinking water and ‘treatment and disposal of human excreta and sewage.’ Preventing human contact with feces is part of sanitation, as is hand washing with soap. Sanitation systems aim to protect human health by providing a clean environment that will stop the transmission of disease, especially
A tool is an object that can extend an individual’s ability to modify features of the surrounding environment. Although many animals use simple tools, only human beings, whose use of stone tools dates back hundreds of millennia, have been observed using tools to make other tools. Early tools, made of such materials as stone, bone, and wood, were used for preparation
A hammer is a tool, most often a hand tool, consisting of a weighted “head” fixed to a long handle that is swung to deliver an impact to a small area of an object. This can be, for example, to drive nails into wood, to shape metal (as with a forge), or to crush rock. Hammers are used for a wide range of driving, shaping, breaking
Power system protection is a branch of electrical power engineering that deals with the protection of electrical power systems from faults through the disconnection of faulted parts from the rest of the electrical network. The objective of a protection scheme is to keep the power system stable by isolating only the components that are under fault, whilst leaving as much of
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Heads of state Current heads of state at the time of the release Ilham Aliyev, President of Azerbaijan Sebastián Piñera, President of Chile Denis Sassou Nguesso, President of the Republic of the Congo Nicos Anastasiades, President of Cyprus Luis Abinader, President of the Dominican Republic Guillermo Lasso, President of Ecuador Ali Bongo Ondimba, President of Gabon Abdullah II, King of Jordan Uhuru Kenyatta, President
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