The CIA no longer denies that Area 51 exists. Officials acknowledge the existence of the facility, though will not admit to what actually happens there.
According to the FBI, the document was first made public in the late 1970s and more recently has been available in the "Vault," an electronic reading room launched by the agency in 2011, where it has become the most popular item, viewed nearly 1 million times.
Scientists at the University of Wisconsin-Madison are helping search for evidence of alien life not by looking into outer space, but by studying some rocks right here on Earth.
