Is “Area 51″ where the U.S. government kept a downed alien spacecraft? Or was that just a cover story for something even more revolutionary?

In her new book “Area 51,” journalist Anne Jacobson speaks to numerous individuals who used to work at the secret military installation and concludes that the site was largely used for weapons research and espionage, and not to house little green men.

This video is from CBS News, broadcast Monday, June 13, 2011.