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There are a number of pictures in the grid.
As you hover over each picture a blue screen appears on which there is some information about what is being shown in the picture.
Read this information and look at each picture to make sure you understand what is being shown.
When you think you understand simply click on the frame and the picture and information will disappear.
Do this with all of the pictures in turn until you know all about the topic.
To start the activity again just refresh the page.