We explain what the countryside and the city are, the characteristics of each one and its importance. Also, what are their differences? What is the country and what is the city? The countryside and the city are the two main physical spaces in which the population sits and which present great natural, social and economic differences between them that influence the lifestyle of the individuals…
We explain what acids and bases are and how these substances can be measured. Also, what are its characteristics and various uses. What are acids and bases? Acids and bases are substances that exist in nature and are distinguished by their pH level , that is, by their degree of acidity or alkalinity. Both, however, tend to be corrosive,…
We explain what the Braille writing system is, its origin and how this system works. In addition, its characteristics and translation. What is Braille? It is known as Braille or Braille System to a reading and writing system designed for blind people , based on the sense of touch . It was created in the mid-nineteenth century by Louis Braille, a French pedagogue who was…
We explain what totalitarianism is and what its characteristics are. Also, its differences with authoritarianism and some examples. What is totalitarianism? Totalitarianism is a form of state in which a single political party rules with absolute power without any limitations. The concept of totalitarianism defines states, ideologies, groups or movements where freedom is deprived , and through which the State concentrates all powers in…
We explain what the speech apparatus is, its component organs and their functions. Also, what are its characteristics and types of voice. What is the speech apparatus? The speech apparatus or vocal apparatus is known as the set of organs of the human body (and of other higher animals ) that allow the emission of articulated sound . In addition, in the exclusive case…
We explain what alkali metals are, what their properties and abundance are. Also, its general characteristics and examples. What are alkali metals? Alkali metals (or simply alkaline) are called six specific chemical elements , characterized by having a single electron in their last energy level or outermost shell. Furthermore, in all metals of this type, that electron is located in an s orbital, which…
We explain and summarize the history of photography, which were the first invented devices and their main characteristics. History of photography The history of photography is the recount of inventions, scientific discoveries and technical improvements that allowed humans to capture for the first time an image on a photosensitive surface, using light and certain chemical elements that react with it. The history of photography spans…
We explain what a monopoly is and what its causes and consequences are. In addition, its characteristics and how to combat it. What is the Monopoly? In economics , a monopoly is called the lack of commercial competition in a specific sector , item or economic activity, which allows a single person or company to have almost full control of the product or service. This…
We explain what hydrogen is and what its atomic and physical properties are. In addition, its general characteristics, uses and risks. What is Hydrogen? Hydrogen is the first element on the periodic table and the most abundant in the known universe : it constitutes more than three-quarters of all observable matter . It is a light element, with the simplest known atomic shape, and usually appears as a colorless,…
We explain what the bourgeoisie is, how it originated and the values it upheld. Also, what are its general characteristics and examples. What is the Bourgeoisie? The term bourgeoisie is usually referred to as the wealthy, owner and capitalist middle class , although this term can be used with various ranges of nuances in political, economic, sociology and history philosophy . The term, as well…