Slipstream is a new generation of reading resources specifically designed for struggling and reluctant readers. Through exciting and carefully levelled texts, Slipstream enables readers to accelerate their reading experience. This book is part of Slipstream LEVEL 2. The 350-word text is levelled for readers with a reading age of 7-9, but its engaging content makes it perfect for a wide range of older readers too. All texts are levelled by reading experts Dee Reid and Diana Bentley. Do you know what is the toughest material? Or the name of the toughest helicopter? What about a robot that goes into volcanoes? No? Then find out in World's Toughest - filled with facts about some of the toughest things on Earth.