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Powerful magnets are usually used for fix memos, postcards and photos on boards such as the desks in rooms, or the refrigerator in the kitchen. However, this unnoticeable thing will become the terrible nightmare if you make them stick together imprudently. Most people have this terrible experiences of splitting the powerful magnets apart- especially without any tool. This concept is that the edges of the magnet are pared to create some extra areas for separating apart. Besides, this little extra area is designed to be coated with different color to notice people where it is.
National Chiao Tung University