When was America discovered , Tony ?   I'm not certain . Do you know ?   America was discovered by Christopher Columbus in 1492 .   In a way that's right . But the Vikings travelled there long beforeColumbus . And what about the Red Indians ?   All right . Ask me a question now .   Who invented the electric light bulb ?   That's easy . It was invented by Edison .   Correct . Now for a harder question . Who will be the first men on Mars ?   I can't answer that . But I think Mars will be visited by men before theed of this century .   Ask me a question now . 