NARRATOR: Geeta and Paul are final year archaeology students who, with the help of a mysterious character called the Professor, have used a machine called Virtually Anywhere to virtually transport themselves around the world. Having narrowly escaped the Emperor's tomb in China, they now find themselves at Teotihuacan in Mexico.

PROFESSOR: Is everyone OK? Breathing? Good! Everyone's breathing! Well, that was very interesting indeed!

GEETA: Interesting? We nearly died!

PROFESSOR: No! No ... Look, we're all fine.

PAUL: Fine? Fine! If this is just a computer program, then how come the mercury made us feel so ill? What's going on Professor?

PROFESSOR: Paul, Paul, Paul! First things first - get up off the floor. Look, to answer your question: Virtually Anywhere will simply try its best to make any situation feel exactly like it would in real life.

GEETA: Well, when we were trapped in that tomb, you sounded like you were panicking too!

PROFESSOR: Well ... I wouldn't say panicking - I was just excited! Anyway, we're all here and we're all fine, so welcome to the ancient city of Teotihuacan! Follow me!

GEETA: Come on Paul, let me help you up.

PAUL: I still feel sick.

GEETA: Me too.

PROFESSOR: You two - over here! Come and look at this!

PAUL: What a view!

GEETA: Yes, I've read about this place. This is The Avenue of the Dead; it's a large street that runs right through the middle of the city. It was the centre of life in Teotihuacan, and there would probably have been a huge market all around, full of people making and selling all sorts of things. These days it's all very peaceful and quiet - just a handful of tourists wandering around. We can only imagine what it would have looked and sounded like in the past ...

PROFESSOR: Well perhaps I can help! I can program Virtually Anywhere to show us what it would have been like back then. There we go!

PAUL: Wow! How is this possible Professor? Is that the actual market? It looks so real.

GEETA: Yes, how is it possible Professor? Considering that no one actually knows for certain who originally built and lived in Teotihuacan.

PROFESSOR: Without getting too technical Geeta, Virtually Anywhere looks at all the information it can find and then makes a best guess as to how it would have looked at the time.

GEETA: OK, I guess that makes sense. It is pretty impressive!

PAUL: Shall we have a look about?

GEETA: Have you seen the birds for sale over there? I've not seen any like them before!

PAUL: They're amazing.

GEETA: Have you noticed that food stall? What are those vegetables?

PAUL: I've got no idea. And look, Geeta - check out the masks and bowls that these craftsmen are making.

GEETA: Yes! I've read about this as well, they were made out of a special kind of rock ...

FERNANDO: ... called obsidian.

GEETA: Where did the market go?

PROFESSOR: Something disrupted the signal. I think it was this chap right here.

FERNANDO: Fernando, at your service! I am your tour guide for today! As I was saying, many of the items discovered in the city were made out of obsidian - it is a type of glass that comes from volcanoes, and the ancient people of Teotihuacan used it for making all kinds of things.

PROFESSOR: Fascinating stuff. It's very nice to meet you Fernando, and I'm sure my archaeological student friends have lots of questions to ask ...

FERNANDO: Archaeology students? Very cool - you already have some knowledge then. So tell me, have you noticed anything interesting about this road we're standing on?

GEETA: Paul!

PAUL: What? What's happening to me?

GEETA: Paul! He's disappearing! Paul! Paul! Professor, what's happening? He's ... He's gone!