Hard Quiz — Episode 12: Novak Djokovic, Mary Poppins, black holes & the European Union

You are watching the episode Novak Djokovic, Mary Poppins, black holes & the European Union Tom Gleeson squeezes another four expert contestants through the Hard Quiz wringer. Their special subjects include Tennis World Number One Novak Djokovic, whimsical nanny Mary Poppins, black holes and the European Union.