Transdisciplinary Themes

Dry land. Thirsty plants. When rains don't come, droughts happen. Desert, forest, or prairies, droughts can happen anywhere. Discover how small shifts in rain amounts can cause big changes to the land. Learn about droughts, what causes them, and how...

Biomes are home to unique animals and plants. Give beginning readers an introductory look at the Amazon rain forest! Readers will get an up-close look at the characteristics of the land and weather and how monkeys, parrots, anacondas, sloths, and other...

Biomes are home to unique animals and plants. Introduce beginning readers to the African Savanna biome! Readers will get an up-close look at the characteristics of the land and weather and how zebras, lions, giraffes, and other animals have adapted to...

A person needs to get a hospital quick! What vehicle can get them there fast? An ambulance! Ambulances carry the equipment needed to help people in an emergency. Young readers will find out about ambulances, their main parts, and how these important...

Every four years, the world celebrates one of the most exciting contributions of the Ancient Greeks: the Olympic Games. That, of course, is not all this great civilization left behind. From theater to democracy, discover how the Greeks' ancient...

The Ancient Egyptians are famous for their pyramids and mummies, but how do these ancient items impact your life today? From hieroglyphs evolving into emojis and kohl around the eyes evolving into eye liner and mascara, the inventions and discoveries of...

From pasta to paper, the inventions of the Ancient Chinese remain part of everyday life in our modern world. Learn how items like wheelbarrows, the first toothbrushes, and early earthquake detectors have evolved into devices we know today and discover...

Why should you care about climate change? Weather affects your everyday life and climate change can have major impacts. Discover how scientists study climate change, what current research shows, and what you can do to reverse its effects.

Birds chirp. A dog barks. Thunder claps. We hear sounds all around us. But how? Sound waves travel through the air, but we don't see them. With engaging, at-level text and colorful images, readers will learn about sound waves and how we use them every...

You see your shadow outside on a sunny day. A rainbow appears in the sky after a storm. Light waves are all around us, even when it's dark. With engaging, at-level text and colorful images, readers will learn about light waves and how we use them every...

The sun is out. The temperature is hot. And Sasha has everything packed and ready for a full day of swimming! But Mr. Sloth is taking for-eh-ver! Sasha does NOT like to wait. However, her best friend is never in a hurry. Will Sasha learn to be patient,...

Lava shoots into the air, then bubbles down mountains, flattening, burning, and boiling everything in its path. The destructive forces of volcanoes are terrifying and well-known. But what about their other forces? Volcanoes can spur new growth of plants...

Have you ever heard of a mammal that lays eggs? What about a mammal that can give birth to 50 babies at once? Young readers learn all about echidnas, Tasmanian devils, and other mammals with unusual life cycles.

Have you ever heard of a frog that freezes solid in winter? What about a toad that carries its eggs on its back? Young readers will learn all about wood frogs, suriname toads, and other amphibians with unusual life cycles.

Why do we yawn? Are left-handed people more creative? Why do we have fingerprints? When it comes to our bodies, there are a whole lot of questions we’re still trying to answer. Get ready to explore the unknown and discover how scientists are working to...

How did Earth form? Where did all the water come from? How did Earth's plates begin to shift? When it comes to our planet, there are a whole lot of questions we're still trying to answer. Get ready to explore the unknown and discover how scientists are...

In July 1969, astronauts on the Apollo 11 spacecraft became the first people to land on the moon. Since then, people have told stories about the historic event. Did an unmanned Soviet spacecraft crash into the moon while the Apollo astronauts were on it?...

The 1922 discovery of King Tut's tomb is one of the most important ancient Egyptian finds in history. People have told stories about it ever since. Are there rooms in King Tut's tomb yet to be discovered? Did clues point to King Tut being murdered? Read...

Wesak is about celebrating Buddha. It is a Buddhist holiday. People clean and decorate temples for the celebration. Then, they honor Buddha at temples by making offerings and reciting holy texts. People also do good deeds during Wesak. Readers will...

Rosh Hashanah, the Jewish New Year, is the first of the Jewish Holy High Days and one of Judaism's holiest days. Often called the birthday of the world, it is celebrated on the first day of Tishrei, the seventh month of the Hebrew calendar. People...