- Conservation Canines
- Conservation of Mass
- Conspiracy!
- Conteo: Los biomas de la Tierra
- Continents of the World
- Cooling Off
- Copos de nieve
- Coral Reefs
- Coral Reefs: In Danger
- Corazón de metal
- Corpo Humano - Perguntas e respostas Ed.01
- Corpses, Cats, and Moldy Cheese
- Cosmic
- Cosmic Catastrophes
- Cougar Crossing
- Cougars
- Counting Birds
- Counting on Katherine: How Katherine Johnson Saved Apollo 13
- Counting on Snow
- Counting: Earth’s Biomes
- COVID-19
- Cows Don't Live in Trees!
- Coyote Moon
- Craft It: Hand-Blown Glass
- Crafty Makes: Nature Craft
- Crayola ® Amphibian Colors
- Crayola ® Bird Colors
- Crayola ® Colorful STEAM Activities
- Crayola ® Fish Colors
- Crayola ® Insect Colors
- Crayola ® Mammal Colors
- Crayola ® Nature STEAM Activities
- Crayola ® Our Colorful Earth
- Crayola ® Rainy-Day STEAM Activities
- Crayola ® Reptile Colors
- Crayola ® Science of Color
- Crayola ® Super Simple STEAM Activities
- Crazy Contraptions: Build Rube Goldberg Machines that Swoop, Spin, Stack, and Swivel
- Creating Art Together
- Creating Colors
- Creatures Great and Small
- Creatures Yesterday and Today
- Creek Critters
- Creeping Slime
- Crows!
- Crumble and Custard and Other Puppy Tales
- Cuerpo de nube (Little Cloud Lamb)
- Cultivado en Harlem (Harlem Grown)
- Cultivar plantas en el espacio
- Curious About Fishes
- Curious About Fossils
- Curious About Orangutans
- Curious About Pluto
- Curious About Snow
- Curious About Worms
- Curious About Zoo Vets
- Curious Creatable Creatures
- Curious Creatures Down Under
- Curious Lists for Kids – Human Body
- Curious Minds & Great Voyages in Science
- Curious Q&A About Our Planet
- Curious Q&A About Science
- Curious Q&A About The Solar System
- Curly the Chameleon
- Cute as an Axolotl
- Cutting Down a Water Oak Tree
- Cómics de ciencia. Murciélagos
- Cómo funcionan los juguetes
- Cómo funcionan los parques de diversiones
- Cómo quitarse el frío
- Cómo refrescarse
- Cómo una curiosa oruga se transforma en una hermosa mariposa