harpercollins

Some dinosaurs were big. How big? As long as four school buses in a row, as heavy as sixteen elephants. Some dinosaurs were small. How small? Read ...

After rain comes down, the sun comes out and dries the puddles. But the water isn't gone. The heat from the sun has turned it into water vapor-it h...

You've seen your own blood, when you have a cut or a scrape. You can see the veins in your wrist, and you've seen the scab that forms as a cut heal...

Why don't ducks get wet? Ducks dip and dive, but they stay dry because they spread oil over their feathers to make them waterproof. Learn more insi...

Read and find out about one of nature's most mysterious forces-the earthquake. Some earthquakes are so small that you don't even feel them, while o...

Did you know that energy comes from the food you eat? From the sun and wind? From fuel and heat? You get energy every time you eat. You transfer en...

Book DescriptionPublisher: HarperCollinsAuthor: Illustrator) Arthur Dorros (AuthorISBN: 9780064450959Pages: 32Format: PaperbackDimensions: 10 x 0.1...

"[In] a revision of the 1963 edition, [a] brief, clearly written text [tells of a young girl who] learns some interesting facts about fireflies fro...

Did you know that lightning bolts can be over a mile long? Or that they may come from clouds that are ten miles high? Storms can be scary, but not ...

Don't jump! If you're on the space shuttle, that is. Astronauts never jump in space. They usually drink out of straws, and they lift tons of equipm...

Water is always flowing, from a brook to a stream, to a river to the ocean. Read and find out more about how water shapes the earth and why it is i...

There are forces at work whenever you throw a ball, run up the stairs, or push your big brotheroff the couch. Want to learn more about the forces a...

What is a fossil? Sometimes it's the imprint of an ancient leaf in a rock. Or it could be the skeleton of a dinosaur that has turned to stone! With...

A caterpillar comes to school in a jar and the class watches the caterpillar each day as it grows and changes. Soon, it disappears into a hard shel...

Pumpkins can be baked in a pie, carved into jack-o'-lanterns, and roasted for a healthy snack. But how does a tiny seed turn into a big pumpkin? Wi...

Winner of the American Association for the Advancement of Science/Subaru Science Books & Films Prize for Outstanding Science Series A tadpole i...

How are you feeling? Most of the time you feel fine, but sometimes you get sick. Sometimes a germ catches up with you. Germs are all around you, bu...

What goes up must come down. Everybody knows that. But what is it that pulls everything from rocks to rockets toward the center of the earth? It's ...

Night and day, whether you're asleep or awake, your heart is always beating. Read and find out how your heart works and how to keep it healthy. Edi...

In spring and summer, honeybees gather nectar to make into honey. These fascinating insects live and work together in complicated societies, comple...

How does a tiny acorn grow into an enormous oak tree? With beautiful and accurate watercolor illustrations from Loretta Krupinski, this book by Hel...

A baby scorpion rides on its mother_s back. A baby alligator hides in its mother_s mouth! What about a baby leopard? A baby elephant? Read and find...

Book DescriptionPublisher: HarperCollinsAuthor: Betsy MaestroISBN: 9780064451178Pages: 32Format: PaperbackDimensions: 9.8 x 0.1 x 8 inches

Birds don't need maps! Many birds make long journeys twice each year as they migrate between their winter and summer homes. Arctic terns fly more t...