Mysterious lights that appeared in the skies over Arizona and Missouri July 27 have people buzzing across America, now that videos have been posted on YouTube. The lights appear to be floating in formation over Tucson, Ariz., and Kansas City, Mo., with witnesses indicating they were silent. “Look over there! There’s another one,” says a man recording video of the event in Tucson. “What the hell are they? They’re not jets. We heard jets fly over us all morning. … They’re completely silent.” A woman on the recording says, “You can’t even see what they are. … It’s freaking us...