Carl Johan Calleman is one of the most acknowledged experts on the Mayan Calendar. He has devoted his life to study the calendar from a scientific point of view and written many books on the subject, one of them were released recently. The Mayans were a highly developed Indian culture in the middle America and the first to keep track of time through calendars. Many have wrongly said that the end of the Mayan calendar 2012 means the end of the world.
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