Residents in five Midwestern states were shaken by the sight of an enormous fireball that streaked across the night sky on Wednesday evening. While the National Weather Service is uncertain as to what exactly caused the phenomena, they suspect it may have been a meteoroid entering the atmosphere, since the Gamma Virginids meteor shower is in the midst of a 48 hour window of peak activity. More on the story, including video of the fireball from a number of different angles, at CNN.com.