Aliens among us: the evidence

"The Pentagon is the headquarters of the United States Department of Defense. It is the head of the military. But it has also come under fire for keeping mysterious secrets under wraps-including possible proof of alien life. Find out what other out-of-this-world information the government has kept hidden"--Provided by publisher.

"Our solar system is more than 6 billion years old. Scientists believe there was life on Mars 4 million years ago. Many people on Earth believe they are the only life forms in the universe. But, with millions of undiscovered planets out there, can that really be true? Find out how life began on Earth, how far humans have come in a short period of time, and how we might measure up to other worlds"--OCLC.

"The odds of us being alone in outer space are small. Maybe we've already been visited by alien life, but didn't even know it. What if those life forms are still here? Jump into some of Earth's most alien mysteries and explore the signs they may have left behind"--.