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1. Languages are not static. On the contrary, they are dynamic. There is a difference between the current English that is spoken and the one that was written during the past centuries. Mobility is therefore present in languages.

2. Social mobility - Sociology

2.1. Definition : Social mobility is the movement of individuals, families, households, or other categories of people within or between social strata in a society. It is a change in social status relative to one's current social location within a given society.

2.2. A short video to explain social mobility

2.3. A good podcast from Oxford University about social mobility and the role of universities

2.4. It is more than ever a burning issue, for many people say that it is not possible to move up the social ladder any longer...

3. Population mobility - Geography

3.1. Definition : Geographic mobility is the measure of how populations move over time. Geographic mobility, population mobility, or more simply mobility is also a statistic that measures migration within a population. Commonly used in demography and human geography, it may also be used to describe the movement of animals between populations.

3.2. First of all, we have never been always 7 billion inhabitants in the world. There has been many changes in History. Watch this video to understand better the evolutions of the whole population.

3.3. Moreover, there are a lot of migrations and people rarely stay in their home land all their life long, whereas it was not the case previously. As you can see on this website, there has been many a migration wave in History.

4. Transports for mobility - History

4.1. Definition : Transport is the movement of humans, animals and goods from one location to another. In other words the action of transportation is defined as a particular movement of an organism or thing from a point A to the Point B.

4.2. Evolution of transports in History : If you want to know more about this subject, you can click to read this interesting article

4.3. We can wonder what will be the transports of tomorrow. Maybe the flying cars will take the place of normal cars. Electric vehicles probably stand for the future because they are eco-friendly. Watch this video to know more about future transports.

5. What is mobility? - Philosophy

5.1. Definition : Mobility is the quality or state of being mobile. For humans, it is the ability to move physically.

5.2. Mobility means that an object or a person is not immobile. Therefore, mobility stands for movement.

5.3. Lucretius said in his book (De rerum Natura) that everything is in movement, with the principe of atomism. This is called "clinamen" and it means that atoms move straight down. Read the Following link to know more…

5.4. Many scientists have proven that mobility is good for health. Indeed, we all know that it is important to make sport and to move so as to remain healthy.

6. Mobility of languages - Linguistics

6.1. Definition Language is a system that consists of the development, acquisition, maintenance and use of complex systems of communication, particularly the human ability to do so; and a language is any specific example of such a system.

6.2. Every language is mobile. Some words disappear, whereas many others are created and are added in dictionaries each year. If you want to know all the new words that were added to the Oxford English dictionary last year (there are many), please click on the link.

6.3. People rarely speak only one language. They try to master different languages in order to communicate with more people all around the world.