The World Expo 2020 in Dubai ends this month. Since October 2021, visitors from all over the world have had the chance to discover the industrial and cultural achievements of 192 countries. But do you know what is a World Expo? How long have they existed? What is the relationship between World Fairs and the Eiffel Tower in Paris, the Crystal Building in London or the Atomium in Brussels? All the answers in our playlist of the week!