Grade 4

In 1936, the New York Yankees wanted to test a hot prospect named Joe DiMaggio to see if he was ready for the big leagues. They knew just the ballplayer to call—Satchel Paige, the best… Read More →

Sylvia Freeman is ready to start fifth grade at Fork Hollow Elementary. Being the new kid will be a challenge, but she's counting on her great-grandmother and best friend, Miz Lula Maye, to… Read More →

Jaclyn Roessel live in Kayenta, Arizona, on the Navajo reservation. Like most young girls, Jaclyn has many interests. She likes her math class, she plays basketball and volleyball, and she… Read More →

The Intasimi Warriors are about to embark on their third and most challenging adventure to date—saving their beloved mentor from dying at the hands of the Life Drinkers. When Soni discovers… Read More →

When President Barack Obama nominated Sonia Sotomayor to the Supreme Court of the United States, the country celebrated. Not only would the Supreme Court welcome its third woman justice but… Read More →

Associate justice Sonia Sotomayor is the first Hispanic person and third woman to serve on the US Supreme Court. She has been breaking barriers since reading detective novels and watching… Read More →

Born 20 years apart, Sophia Smith and Abby Wambach have both ruled the soccer field as forwards. Their skills have even led them both to the FIFA Women’s World Cup! But who is better? Compare Read More →

What does S.O.S. mean? Who might use S.O.S.? Sometimes we have to do things we don't think we can do. Have you ever had to do that? What happened? How did you feel before, during and after… Read More →

Our world is full of sounds. There are people sounds, animal sounds, sounds of nature and machine sounds. Sounds are made by vibrations. Vibrations are movements you can feel but not see.… Read More →

Much of what you experience—from the things you see to the sounds you hear—travels to you in waves. But how do sound and light waves work? For thousands of years, scientists have been testing Read More →

Without sound there would be no chatting, laughing, bird song, or listening to music. But what exactly is sound and how do our ears and brain ensure that we get to enjoy it? In this… Read More →

An interactive introduction to musical instruments with 50 original compositions to listen to—from the kazoo to the bassoon. What does a double bass or a sitar sound like? What's the… Read More →

Where in the world can you see the world's largest rodents, galloping around in herds? Where can you find the world's largest river or the highest waterfall? The continent of South America! Read More →

Pack your bags! We’re headed to South Korea. On this whirlwind tour, you’ll learn all about the country’s landscape, culture, people, and more. We’ll explore coastal islands and mountain… Read More →

Imagine watching a space shuttle on the launchpad, ready to blast off into orbit. Astronauts have embarked on some of the most amazing adventures and made incredible discoveries. Yet sadly… Read More →

Have you ever watched video of astronauts walking on the moon? Margaret Hamilton programmed software that helped get them there. As a girl, Hamilton loved math and science. She grew up during Read More →

Explore outer space through interactive augmented reality experiences! Outside the International Space Station, temperatures can reach 250˚F (121˚C) in sunlight and drop to -250˚F (-156˚C) in Read More →

Space is the name for the areas of the universe that are between planets, stars, and galaxies. Right now, there are people living in space; they are astronauts. Astronaut is an old word… Read More →

Explore outer space through interactive augmented reality experiences! Space is a dangerous place for humans. That's where robots and rovers come in! The Curiosity rover drills into a rock on Read More →

Don't panic, but you're alone on a space ship roaring away from Earth! Solve a series of puzzles to pilot the ship to the Moon, then refuel for the return to Earth. Devised by an expert on… Read More →