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Carl Johan Calleman, (born 15 May 1950, Stockholm, Sweden), is a toxicologist as well as an author and speaker on the millenarian New Age interpretation of the Mayan calendar known as Mayanism. He differs from professional Mayanists in seeing 28 October 2011 and not 21 December 2012 as a significant date. Calleman does not interpret the date as an apocalypse, Armageddon, or other cataclysmic event but a slow transformation of consciousness in which people experience a higher "unity consciousness."