Aliens and Secret Technology

This book is an overview of both the history of aliens and UFOS, as well as a review of hidden aerospace and propulsive technologies.
Where did these technologies come from? And how have they developed in the intervening years?
What are some of the Alien races which exist? Do we have a secret space force and are their secret bases on the moon?
Also, I try to answer some questions of how likely some of these claims are-because some things having to do with UFOs and aliens are much more documented than others.
There are also details of many alien related and secret programs that most readers may have never heard of. The most interesting ones are summarized here.