目录:
01-I Wonder Why Camels Have Humps
02-I Wonder Why Castles Had Moats
03-I Wonder Why Caterpillars Eat So Much
04-I Wonder Why Columbus Crossed The Ocean
05-I Wonder Why Greeks Built Temples
06-I Wonder Why I Sleep
07-I Wonder Why Leaves Change Colour
08-I Wonder Why Penguins Can't Fly
09-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 Whystars 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