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When we humans appeared on the evolutionary stepladder, we had much stronger sense of smell. In time we lost a larger part of it because it wasn't necessary. Here you can read more facts about sense of smell and other interesting facts about scents.
Perfumes can benefit the person that carries it (and the persons around). It affects more than our nostrils and is much more powerful than we probably think. Read more about benefits of using perfumes.
Pleasant fragrances were popular, in some form or other, since the prehistory. They are still popular and the most popular form of a nice odor is perfume. Learn some facts about perfume here.
There are thousands and thousands perfumes in the world today and to help the general consumer to choose a perfume a few methods of perfume classification and description are invented.