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Demography
Structure and Dynamics
Demography is the science that examines the structure and dynamics of population. Demographic change describes the dynamics of population size and structure. Tools of the trade for demographers are statistics. Among the decisive factors of population development are fertility (describing the development of births over time), mortality (that is the death rate), immigration and emigration.
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Air Traffic
Being able to fly has been a dream of humanity from time immemorial. But it does not even date back a century that people actually started being able to travel through the air. Since the 1960s, the number of flight passengers has been constantly increasing. Thus, the airspace is no longer dominated by birds but by man-made flying objects.
Stalking
n Germany, 12 % of all federal citizens are pursued by a stalker once in their lives. And not only celebrities are among their victims! Everyone may be confronted with such a situation.