Harvard Study Explores Possibility of Hidden Alien Civilizations on Earth

Researchers propose that unidentified phenomena may be linked to non-human intelligences living in stealth among us.

The study suggests aliens could be living underground, on the moon, or disguised as humans.
Four types of 'cryptoterrestrials' are proposed, including ancient advanced humans and intelligent dinosaurs.
The research urges the scientific community to consider these theories with an open mind despite expected skepticism.
The paper highlights unusual characteristics of UAPs, such as unexplained flight patterns and underwater travel.
The study is yet to be peer-reviewed and aims to stimulate debate within scientific and academic circles.