The Maya and their calendars

Doomsday Mayan calendar: A replica of "La Estela 6 de Tortuguero", the tablet comprised of three rectangular pieces that announces the end of an era of the Mayan calendar. IMAGE

Reuters: Victor Ruiz Garcia. Doomsday Mayan calendar: A replica of "La Estela 6 de Tortuguero", the tablet comprised of three rectangular pieces that announces the end of an era of the Mayan calendar. IMAGE

12/20/12

The Maya developed many calendar systems to fit a variety of purposes, but scholars insist their famous Long Count calendar was not designed to predict the world’s end.

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A tornado is a narrow, violently rotating column of air that extends from the base of a thunderstorm to the ground. Because wind is invisible, it is hard to see a tornado unless it forms a condensation funnel made up of water droplets, dust and debris. Tornadoes are the most violent of all atmospheric storms.