Needed heat to grow
Very dry
Only two explorers can visit the cave at one time
The mystery goes on
Some people believe the Mesoamrican people made the skulls thousands of years ago
Some stories say they have special powers,such as the ability to make sick people well
Moviemakers love these stories
In the 2008 movie Indiana Jones and the Kingdom of the ,the skulls had great power
In the movie,a crystal skull is actually the head of an alien
Most scientists don't believe these stories
They think the skulls are more modern
Scientists have found marks on the skulls that they believe only more modern technology could make
Because of this,scientists are certain the skulls are not thousands of years old
Instead,they think the skulls are from the 19th century
Scientists also point to the British Museum's excavations