Ellen put him to the test with one of her favorite kids from the show "Child Genius."
Magician Paul Vu made Ellen a literal work of art with his amazing Rubik's Cube tricks.
Nate is a preschooler whose love for geography, countries, flags, and more has really put him on the map!
Ellen tested her audience's intelligence with this seemingly simple quiz.
The "Big Bang Theory" star had some big-time fun with Ellen in her quick-witted game!
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Watch what happened when Ellen and her audience played a very special – and very live – round of Epic or Fail.