[speaker001:] When was America discovered, Tony?
[speaker002:] I'm not certain. Do you know?
[speaker001:] America was discovered by Christopher Columbus in 1492.
[speaker002:] In a way that's right. But the Vikings travelled there long beforeColumbus. And what about the Red Indians?
[speaker001:] All right. Ask me a question now.
[speaker002:] Who invented the electric light bulb?
[speaker001:] That's easy. It was invented by Edison.
[speaker002:] Correct. Now for a harder question. Who will be the first men on Mars?
[speaker001:] I can't answer that. But I think Mars will be visited by men before theed of this century.
[speaker002:] Ask me a question now.
[speaker001:] All right. What is the nearest planet to the sun?
[speaker002:] That's easy. It's.. er. Venus. NO. Pluto. No. Wait a minute. It's Anthe tip of my tongue. Oh dear, what is the nearest planet to the sun?