1. I Wonder Why Camels Have Humps
2. I Wonder Why Castles Had Moats
3. I Wonder Why Caterpillars Eat So Much
4. I Wonder Why Columbus Crossed The Ocean
5. I Wonder Why Greeks Built Temples
6. I Wonder Why I Sleep
7. I Wonder Why Leaves Change Colour
8. I Wonder Why Penguins Can't Fly
9. I Wonder Why Planes Have Wings
10. I Wonder Why Pyramids Were Built
11. I Wonder Why Romans Wore Togas
12. I Wonder Why The Sea Is Salty
13. I Wonder Why Snakes Shed Their Skin
14. I Wonder Why Soap Makes Bubbles
15. I Wonder Why Spiders Spin Webs
16. I Wonder Why Stars Twinkle
17. I Wonder Why The Sun Rises
18. I Wonder Why Tunnels Are Round
19. I Wonder Why The Wind Blows
20. I Wonder Why Zips Have Teeth