Marie Curie studied the radiation of all compounds containing the known radioactive elements, including uranium and thorium, which she later discovered was also radioactive. She also found out that:
- you can exactly measure the strength of the radiation from uranium;
- the intensity of the radiation is proportional to the amount of uranium or thorium in the compound - no matter what compound it is;
- the ability to emit radiation does not depend on the arrangement of the atoms in a molecule; it must be linked to the interior of the atom itself - a revolutionary discovery!
When she realized that some uranium and/or thorium compounds had stronger radiation than uranium, she made the following hypothesis: there must be an unknown element in the compound which had a stronger radiation than uranium or thorium. Her work aroused the interest of her husband, Pierre Curie, who stopped his own research on crystals and joined the "detective work" with his wife. And Marie was proven right: in 1898 the Curies discovered two new radioactive elements: radium (named after the Latin word for ray) and polonium (named after Marie's home country, Poland).
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What was the answer to California's isolation problem?
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Building a railroad.</u></em></h2>
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es una de las 22 sobre región en que la ONU divide el mundo está compuesta por 16 países de más incluye la isla de Santa Elena
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Advertising motivates people to spend more by conveying useful information, which tells them about product and service choices, and accelerate the regular acceptance of new products and to lift the level of acceptability of established products, so Consumers who view the advertisement update their information and consumption decisions and may purchase the product. In fact demand for product, which advertisement showed, goes up so company ‘s profit increase. Also this event cause on company’s security, it means by increasing its profit,its finance is more stable, so company feel more safety. Finally, company decide to increase the number of its product or it wants to make a new product. for each of them it needs new employee. Thus, advertising makes a job or it increase employment in our society. For example U.S. advertising accounts for about 2.5 percent of the country’s $14 trillion gross national product. American consumers rely heavily on advertising to influence how they spend some $9 trillion annually on various goods and services. A 1999 study by one of the country’s premier econometric modeling firms, the WEFA Group, and Nobel Laureate in economics Dr. Lawrence R. Klein further underscored this economic impact. The study found that advertising played a key role in generating 18.2 million of the 126.7 million jobs in the United States in that year.
3.2-secondly,advertising reduce selling cost. Companies believe that advertising is one of the best way which can introduce their new product to their costumer even other people which do not have any information about their product. They know that it is impossible to introduce their product to each person face to face. It takes a lot of time. In fact their money and their time is wasted by doing this work. At least this event increase their product selling cost, so advertising helping them by showing their product to other people and reduce selling cost.
Spatial devolvement of powers between more than one level of government. Meaning that different geographical spaces have power independent from one another and the federal government itself. Whereas they abdicate certain powers to the higher branches of government which regulate over the whole territory
