Science

Which tree weighs as much as 450 elephants and is the heaviest living thing on Earth? How can a tree have bark on its trunk that grows in rainbow colors? What is the strange red liquid that… More →

Beneath our feet extreme pressure and heat inside Earth's crust is constantly forming new, super-hard rock. Inside this book, readers will find a clear, accessible, step-by-step explanation… More →

Some animals stay in snug burrows or hang upside-down in dark caves. Others take to the sky and migrate thousands of miles. Still others freeze solid on the forest floor! In this colorful,… More →

What could be more fun than counting with a witch in her creepy castle or comparing numbers with a scary vampire? In this enchanting new series, a spooky twist makes basic math skills and… More →

Spots on a Dalmatian. The alternating colors on subway seats. A row of snowmen in an icy field. What do these things have in common? They're all patterns! This new series, developed… More →

Which mountain is more than 5 miles high? How was the mile-deep Grand Canyon formed? Where in the world can you visit a giant rock that's taller than the Chrysler Building or an entire city… More →

On a fall day in a park, a barn swallow spreads its wings and takes off into the air to start a very long journey. The little bird travels thousands of miles during its migration south for… More →

It's a stormy summer evening and rain is beating down in the desert. A slow-moving animal appears from its underground burrow. The desert tortoise has not drunk any water for nearly a year.… More →

From tall mountains and deep canyons to tiny pebbles on a beach, our Earth is a very rocky place. How do rocks form, though? What are rocks made of? How do people use rocks? And where in the… More →

A tiger's orange and black fur blends in with the tall grass. Its prey can't see the large cat as it hunts. A ladybug is bright red with black spots. The insect's colors tell birds that it… More →

A yellow car whizzes by tall buildings. It drops off one person and picks up another. Its color lets us know that it's a taxi. Then a traffic light flashes red. Drivers know that red means… More →

From the underground safety of a prairie dog burrow, a small animal emerges. It scans the grassland with its huge yellow eyes, looking for predators. The animal is not a prairie dog, however. More →