A Long Walk on a Long Wall

Level A1

The Great Wall of China is wide enough to walk on. How long does it take you to walk from one end of the wall to the other?

A Hotel That Melts

Level A1

You can stay in a hotel above the Artic Circle. You cannot go back to the same hotel the next year. Because the hotel will have melted. How?

Underground Cities

Level A1

There are some 2,000 years old cities in Turkey. No one lives in these cities today, but people still visit them. Why do people want to see them?

Fireworks

Level A2

Fireworks first began in China. Later, they went to Europe.

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