4. Why do people invent things? 5. Is everything invented? 5. Where do inventors get their ideas? 6. Which new invention was soon on everyone's lips? 6. Who wore a mouthful of hippo teeth? 7. Why were plasters first invented? 8. Who first flushed the toilet? 9. Who first jumped in the bath? 9. How did horses help keep carpets clean? 10. Who invented raincoats? 10. Why do zips have teeth? 11. Can clothes keep you feeling fit? 12. What did people use before fridges? 13. How were drinking straws invented? 14. Why are bears called teddies? 15. Which toy is 6,000 years old? 15. When did home computer games appear? 16. How do you make toast without a toaster? 17. Who invented the microwave oven? 17. Why don't non-stick frying pans stick? 18. Who scored goals in a basket? 18. Why are trainers so springy? 19. How did people ice-skate in summer? 20. What were the first cars like? 20. How do you ride on air? 21. Which bikes have sails? 22. How can you fit 1,000 books in your pocket? 23. Which computer was as big as a bus? 23. Who was Mr Biro? 24. How did a till settle a row? 25. Who used tea as money? 25. How can a supermarket trolley make you rich? 26. Which came first - screws or screwdrivers? 26. Who had everything under lock and key? 27. Could a horse mow the lawn? 28. Who took hours to take a photo? 28. When could you watch pink TV? 29. Who invented the personal stereo? 30. How can you fight a hungry dinosaur? 31. Are there insects on Mars? 32. Index