Introduction; Part 1. The World around Us: Unit 1. How many planets are there in space?; Unit 2. What's a living creature?; Unit 3. What's a hurricane?; Unit 4. Are there any monsters in the ocean?; Unit 5. What's an ecosystem?; Unit 6. Can bees scare elephants?; Unit 7. Can penguins see underwater?; Unit 8. How hot are chilli peppers?; Part 2. Human Endeavour: Unit 9. Who was Ibn Battuta?; Unit 10. What's the best job for a teenager?; Unit 11. Who are the Maasai?; Unit 12. What does a triathlete do?; Unit 13. How much water do you use?; Unit 14. How important is oil?; Unit 15. How do you say bridge in your language?; Unit 16. Where are the Seven Wonders of the Ancient World?; Unit 17. What impact does fashion have on teenagers?; Unit 18. What does that sign mean?