Mayim Bialik wore a Jewish star while she filmed all of the "Jeopardy!" episodes that she co-hosted. Bialik was announced as one of the new permanent hosts of the game show Wednesday.The "Big Bang Theory" star and executive producer Mike Richards will take over the role previously held by Alex Trebek, who died last November. "Here’s a fun secret: I wore a Jewish star in every episode of ‘Jeopardy!’ that I guest hosted," Bialik told the Jewish Journal.