This undated image made available by National Geographic shows four long numbers on the north wall of a ruined house related to the Maya calendar and computations about the moon, sun and possibly ... more 
This undated image made available by National Geographic shows four long numbers on the north wall of a ruined house related to the Maya calendar and computations about the moon, sun and possibly Venus and Mars; the dates stretch some 7,000 years into the future. Archaeologists have found the small room where royal scribes apparently used walls like a blackboard to keep track of astronomical records and the society's intricate calendar some 1,200 years ago. Anthony Aveni of Colgate University, along with William Saturno of Boston University and others, are reporting the discovery in the Friday, May 11, 2012 issue of the journal Science. (AP Photo/National Geographic, Tyrone Turner) less 
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Associated Press | Photo By National Geographic, Tyrone Turner
Thu, May 10, 2012 3:20 PM EDT