Long time controversy including of course detailed investigations by Ancient Aliens.
The sober Scientific American:
DECEMBER 21, 2012
‘Alien-Like’ Skulls Excavated in Mexico
Skull deformation of children was a common practice in Central America, but scientists are still struggling to solve the mystery of why these otherwise healthy youth died prematurely
BY CHARLES CHOI & LIVESCIENCE
The Sciences
Human skulls deliberately warped into strange, alien-like shapes have been unearthed in a 1,000-year-old cemetery in Mexico, researchers say.
“The most common comment I’ve read from people that see the pictures of cranial deformation has been that they think that those people were ‘aliens,’” García added. “I could say that some say that as a joke, but the interesting thing is that some do think so. Obviously we are talking about human beings, not of aliens.”
Of the 25 burials, 17 were children between 5 months and 16 years of age. The high number of children seen at the site could suggest inept cranial deformation killed them due to excessive force against the skull.
Problem is this skull wasn’t deliberately deformed. It is natural.
The researchers think humans warped their heads to copy these beings who had a superior technology.