Why the U.S. congressional balance of power matters, what we knew at the time of show production, and why some final numbers are still uncertain: These are three midterm-related topics we're covering this Wednesday. And after a quick constitutional quiz, we're also reporting on flooding in the American Southwest, the discovery of an ancient puppy pawprint, and the recovery of a long-lost piece of cinematic history. A well-known Egyptian king and the 1979 Iran hostage crisis factor into our history report. And California police dress up as a giant traffic cone to see if it'll prompt drivers to yield.