John Humphrys invites four talented youngsters to sit in the famous black chair.
Pint-sized boffins are quizzed on classical ballet, the Mini car, Green Day and Elizabeth I.
Subjects are Take That, the Redwall Tales, Dr. Barnardo and Seven Wonders of the Ancient World.
Subjects are Hancock's Half-Hour, Emmeline Pankhurst, The Chronicles of Narnia and Nelson Mandela.
Subjects are the history and traditions of Jewish festivals, Bob Marley, penguins and The Edge Chronicles.
Subjects for the finalists include Jackson Pollock, Liverpool FC, Tintin and Andrew Flintoff.