Grade 4

A character-driven novel about the unlikely friendship between a 10-year-old boy and an elderly woman. The old woman badgers the boy into taking her sailing, but when the weather turns bad,… Read More →

Have you ever tried to invent something? As a child, Nikola Tesla saw a picture of a waterfall and imagined an invention that would turn the water's energy into electricity. Later, he… Read More →

From virtual reality headsets to a musical instrument that can switch instantly from being a guitar to a keyboard. From ocean vacuum cleaners that suck oil, detergents, and trash from the… Read More →

Insects, fish, reptiles, birds, amphibians, and mammals make up the six main animal groups. But did you know that each of these groups has a different life cycle? Or that each group has… Read More →

Electricity powers lights, computers, and television sets. But have you seen how electricity can make objects stick together? Or make other objects pull apart? Now you can! Explore… Read More →

The sun, furnaces, and ovens all make heat. But have you ever watched matter expand when it is heated? Or seen how different kinds of matter conduct heat? Now you can! Explore heat with the… Read More →

The sun, lightbulbs, and flickering fires all bring light to our world. But have you ever watched light rays moving? Or seen how light rays reflect off objects? Now you can! Explore light… Read More →

You know that magnets hold pictures on a refrigerator. But have you ever found a magnet's north pole? Or turned an ordinary paper clip into a magnet? Now you can! Explore magnetism with the… Read More →

Are there signs of life on Mars? What is on the Martian surface? Scientists have made great strides in investigating Mars. Using rovers and orbiters, they’ve learned about the planet and how Read More →

Solids, liquids, and gases are the three states of matter. But have you ever made matter change from one state to another? Or seen how even invisible matter takes up space? Now you can!… Read More →

Flowering plants, cone-bearing plants, ferns, and mosses make up the four main plant groups. But did you know that each of these groups has a different life cycle? Or that some plants… Read More →

Most people are familiar with spring, summer, fall, and winter. But did you know that some places on our planet have a rainy season and a dry season? Or that the Northern and Southern… Read More →

People, animals, machines, and wind all make sounds. But have you ever seen how sound waves move? Or made a sound wave bounce? Now you can! Explore sound with the fun experiments you'll find… Read More →

Carbon is everywhere. It is constantly moving between the air, water, rocks, and living things. But did you know that none of these things would exist without the carbon cycle? Or that humans Read More →

Igneous rocks, sedimentary rocks, and metamorphic rocks make up the three main types of rocks. But did you know that rocks are constantly being created, destroyed, and created again? Or that… Read More →

Water is essential to life on our planet. Water is constantly moving between Earth's surface, the air, and the ground. But did you know that water cannot be created or destroyed? Or that… Read More →

Have you been given an invitation? What was it like? An invitation to a party is usually written on a card or letter so that you will know exactly where and when it will be. What would happen Read More →

Air and water are amazing stuff and lots of fun to experiment with. Both of these elements are vital to life on earth, but how much do you really know about them? Do you know what air and… Read More →

In this inspiring and relevant book, discover how "The Pledge of Allegiance" has become one of the enduring symbols of America's pride. In 1888, a children's magazine announced that a new… Read More →