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DEMOGRAPHY

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👪 Demography is the statistical study of human populations. Demographers use census data, surveys, and statistical models to analyze the size, movement, and structure of populations. 👤Demography is the statistical study of human populations. Demography examines the size, structure, and movements of populations over space and time. It uses methods from history, economics, anthropology, sociology, and other fields. Demography is useful for governments and private businesses as a means of analyzing and predicting social, cultural, and economic trends related to population. 👥While basic demographic studies, such as  censuses , were conducted in the ancient world as far back as 6,000 years ago, demographers as we know them, such as John Graunt from the United Kingdom, came about in the 16th century. The earliest statistical studies were concerned mostly with  mortality  (how many people died and at what age). Through studying baptism and burial records, Graunt could es...
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MAGNETIC FIELD

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  What does the magnetic field mean? Definition: A magnetic field is a force field created as a result of the movement of electric charges (flow of electricity). The strength (intensity or current) of a magnetic field is measured in Gauss (G) or Tesla (T). The flux decreases with the distance to the source that causes the field. How does a magnetic field work? Magnetism is a physical phenomenon by which objects exert forces of attraction or repulsion on other materials. The only known natural magnet is a mineral called magnetite, however, all materials are influenced, to a greater or lesser extent, by the presence of a magnetic field. HOMEMADE COMPASS Our planet acts like a giant magnet, creating a magnetic field that shields Earth from radiation from space. Magnetized metals naturally align with that field, and one can take advantage of that invisible effect in the experiment that shows us how to magnetize a needle to create a compass. What we need? A sewing needle A cork or plast...
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