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I Wonder Why: Stalactites Hang Down

I Wonder Why: The Sun Rises

I Wonder Why: The Wind Blows

I Wonder Why: Triceratops Had Horns

I Wonder Why: Why Camels Have Humps

I Wonder Why: Why Caterpillars Eat So Much

I Wonder Why: Why Columbus Crossed the Ocean

I Wonder Why: Why Greeks Built Temples

I Wonder Why: Why Horses Wear Shoes

I Wonder Why: Why I Sleep

I Wonder Why: Why Kangaroos Have Pouches

I Wonder Why: Why Leaves Change Colors

I Wonder Why: Why Mountains Have Snow on Top

I Wonder Why: Why Penguins Can't Fly

I Wonder Why: Why Pirates Wore Earrings

I Wonder Why: Why Planes Have Wings

I Wonder Why: Why Pyramids Were Built

I Wonder Why: Why Romans Wore Togas

I Wonder Why: Why Snakes Shed Their Skin

I Wonder Why: Why Soap Makes Bubbles

I Wonder Why: Why Spiders Spin Weds

I Wonder Why: Why the Dinosaurs Died Out

I Wonder Why: Why the Sahara is Cold at Night

I Wonder Why: Why the Sea Is Salty