If aliens reach out to us, what would happen first?

It's a question that has puzzled science-fiction fans and scientists alike for decades, and we already may have a hint of how people will react. On Oct. 30, 1938, a dramatized version of the 1898 H.G. Wells novel "The War of the Worlds" played on the CBS Radio system across the United States. The story details how Martians attacked Earth.