DETROIT – As you probably know, an annual NBC tradition is airing “It’s a Wonderful Life” on Christmas Eve -- and this year, more than any other year, we need that movie. There is a way cool science angle to the movie that nobody knows about: Near the beginning, remember the scene where the angels in heaven choose an angel named Clarence to head to Earth to save George Bailey? Well, there’s an ultra-cool science angle to that scene. Check out my explanation in the short video above -- it’ll make your Christmas even more special! RELATED: Best Christmas movie?