This six-level series of factual readers allows English language learners to explore a variety of fascinating real-world topics. Each reader has been carefully graded to reinforce the main structures and vocabulary covered in most major language courses. The use of the plus symbol (+) highlights the increased level of challenge in language as compared to a standard reader, reflecting the focus on content learning. Includes a glossary with explanations of key vocabulary. Free teaching notes, audio and exercises available. Level 4.