"Factfiles" are a sub-series of "Bookworms" with a non-fiction angle providing factual information for students on a wide variety of themes. Exercises at the back of each book check students' understanding of the text and provide ideas for activities and project work.Our world is changing fast. We can travel and speak to people around the world, and use computers to do all kinds of things. But in some places, children go to bed hungry at night, and cannot drink clean water. And many species of animals and plants are now in danger as our climate changes andpollution worsens...a href="http://www.oup.com/elt/bookworms"Free editable tests/a for every book.