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Artificial replacement joints have to be tough and extra smooth. That’s why doctors use replacement joints made with the same long-lasting and strong stuff as sapphires and rubies, a natural mineral called alumina. Learn more about why this gemstone is perfect for making new joints!

What animals do you think live in the desert? Follow Click and Jane as they travel through the desert. Not believing anything can live in the hot, dry desert, Click quickly learns that plenty of creatures make their homes in the desert. As the pair is introduced to different birds, plants, reptiles, coyotes, and owls, Click and Jane are able to come to appreciate the desert.

Have you ever wondered what it would be like to stand next to a real dinosaur? Millions of years ago, Dinosaurs ruled the earth and left their fossils behind for us to find all over the world. These fossils help archaeologists and paleontologists learn about what dinosaurs may have looked like. Some were really big and some were really small. In this story, you will learn all of the different shapes & sizes of your favorite dinosaurs before they went extinct. How will you measure up next to your favorite dinosaur?

Follow Detective Dobson as he investigates Earth's greatest "mass murderer" that led to the greatest extinction event in Earth's history nearly 250 million years ago. Dobson will travel the world investigating fossils—the evidence left behind by the killer that was left behind in the Earth’s crust. Who really was the killer? Was it a Volcano, Climate Change, Poisonous Gas? Help Detective Dobson find the real suspect with paleontology and geology! Will Dobson ever be able to truly find the killer?

Have you ever wondered why it gets dark at night? Listen to learn about how the Earth’s spinning changes day into night and why some days are longer than others.

Este libro tiene como objetivo la divulgación científica de forma comprensible para cualquier persona, independientemente de su formación previa. Está especialmente pensado para niños y jóvenes de edades comprendidas entre los 10 y 16 años y recoge un amplio espectro de temas de interés...

Have you ever visited the Grand Canyon? As one of the world’s seven wonders, millions of people have visited this landmark. Have you ever wondered how it was formed? Learn how the 3 "R"s- Rock, Rivers, & Erosion, have led to the formation of the Grand Canyon and the changes it undergoes in present day.

Have you ever wondered how a river forms, which animals live near rivers, or where those rivers lead? Rivers are a vital part of life and the ecosystem. Rivers help transport water to humans and animals as well. It can also be used to create energy. Water from rivers can end up in many different places downstream!

Follow along with this class as they explore a creek near their school in Pennsylvania! They want to learn about the water and its ecosystem, so they perform a survey to determine its quality and biota. What do you think they will find?

When on land, rivers, lakes, and oceans appear flat. With the aid of satellites, these bodies of water appear to have many designs! Explore the art of nature and how satellites detect the temperature of the many bodies of water around the globe.

Deep underground, unseen forces are at play to move the continents around our globe.

When volcanoes blow their top, watch out! They can blast out dangerous lava, rocks, ash, and steam that can contain clouds of poisonous gas. But when lava cools, it becomes rock, which in turn creates new land.

How is lightning created? And what is thunder? What kind of weather creates the most lightning? This science story shows how lightning is like the spark from static electricity, but much bigger.

Not all forest fires are bad. Controlled burns actually help keep the forest healthy, clear the way for new vegetation, and act as a pest control.

Weather affects us almost every day. When it's raining, we can't play outside. Sometimes weather is even more important. Sometimes weather shapes history.

John Wesley Powell was known for his explorations of the canyon land area of southern Utah and northern Arizona, still "unknown" in the 1860s.

Every visitor of Yosemite National Park in California should say "thank you" to one man: John Muir.

Stretching across the Great Plains, Tornado Alley has the perfect weather conditions for forming tornadoes.

Listen to the first six audiobooks from author Stacy McAnulty’s beloved Our Universe series! This collection includes Moon! Earth's Best Friend; Ocean! Waves for All; Mars! Earthlings Welcome; Earth! My First 4.54 Billion Years; Sun! One in a Billion; and Our Planet! There's No Place Like...

A tree suns and sways in the forest. She is a place to grow, to rest, and to shelter. But what happens when a tree falls? The answer will make your heart soar. In this lyrical book, explore how the extraordinary nurse log provides a nutrient-rich space for new seedlings, shelters small animals, hosts different plant species, and, most profoundly, nurtures a new tree in the process, renewing the cycle of life.