ABC News 
Dec 22, 2012
Archaeologists in Mexico have uncovered 25 “alien”-looking human skulls with in a cemetery in the northwest state of Sonora, they said today.
Some of the skulls showed “deformities,” said Cristina Garcia Moreno, who worked on the excavation project with Arizona State University, which analyzed the bones. The bones are about 1,000 years old, dating from 945 A.D. to 1308 A.D.