AUDIE CORNISH, HOST:
Finally, in Tech today, an app to keep you guessing.
(SOUNDBITE OF THEME MUSIC, JEOPARDY)
CORNISH: Or if you're former "Jeopardy!" champ Ken Jennings, a trivia app called QuizUp to keep you answering confidently.
KEN JENNINGS: I was surprised to find that I was very good at Disney. I patted myself on the back for that.
CORNISH: But even Ken Jennings has a few trivia blind spots.