Possible Clues:

• New World pyramid builders
• Ancient pyramid builders
• Yucatec speakers
• People of the Yucatan
• New World natives noted for their pyramids and calendar
• Settlers of the Yucatán Peninsula
• Pre-Columbian calendar makers
• Pyramid builders in the New World
• Joe Quimby on 'The Simpsons,' e.g
• Pyramid builders