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With X-rays, doctors detect problems human eyes can't see. X-rays are a form of invisible radiation. This powerful medical technology helps experts look inside the body and even treat illnesses. But early on, X-rays caused harm too, as people used them without enough protection. This history covers the discovery of X-rays, the development of safety standards, and the rise of more powerful and precise X-ray machines. Find out how modern doctors create digital images of the inner body—even 3D images of our brains!

Water, air, sunlight, plants . . . we need these elements to live in this world. But does the world need us? And what would happen to the world if humans were gone? This is the premise of a thought-provoking book from John Coy. His insightful text explores how nature would reclaim the planet. The book gives further context and discusses what kids (and all of us) can do to truly help our planet.

Gratitude isn't something we need to save up for a special holiday. What are you grateful for right now, today? This anthology brings together a diverse group of poets who express gratitude for everything from a puppy to hot cocoa to the sky itself. Each writer uses a different poetic form, and listeners will encounter a concrete poem, a sonnet, a pantoum, a sijo, and much more. Contributors include Kimberly Blaeser, Sun Yung Shin, Naomi Shihab Nye, Charles Waters, Janice Scully, Jane Yolen, Traci Sorell, JaNay Brown-Wood, Cynthia Leitich Smith, Margarita Engle, and more.

Open wide! Compare your teeth to those of other animals and find out why teeth come in so many different shapes and sizes. What animal would you be if a few of your teeth grew so long that they stuck out of your mouth even when it was closed? What would you be if your top canine teeth grew almost all the way down to your feet? This book will keep you guessing as you hear about how human teeth are like—and unlike—those of other animals.

A leaf can be a...shade spiller, mouth filler, tree topper, rain stopper. Find out about the many roles leaves play in this poetic exploration of leaves throughout the year.

Rhyming verse from Brian P. Cleary presents the fictional Clip-Clop Elementary School's celebration of "Onomatopoeia Day." Enthusiastic young students make their way from band room (Rattle! Boom! Twang!) to the gym (Whiff! Whack! Swish!) to the science lab (Hiss! Spurt! Ding!) and beyond. Brief back matter offers additional examples of onomatopoeias—words that imitate sounds.

On the verge of winter, the autumn wind issues an invitation: "Come one, come all to the annual windfall ball!" Join all the animals in this rhyming book as they gather for the autumn wind's harvest in preparation for the long winter.

What kind of animal would you be if you had eight eyes? Or if your pupils were the shape of the letter W? Keep an eye out for weird and surprising facts in this playful book, which brings together comparative anatomy with a guessing game format. See how your animal eyes are like—and unlike—those of starfish, spiders, goats, cuttlefish, owls, and slugs. Author Sara Levine presents an insightful view of all eyes can do!

When babies are born early, they often have trouble surviving. But special containers called incubators help babies grow by keeping them warm and protected. At first, people in the medical world were skeptical about incubators. But some trailblazing doctors believed in the technology—and put it on display across Europe and the United States. "Incubator exhibits" showed the public how incubators saved lives. The controversial displays led people to accept this medical innovation. Meet the doctors who invented the incubator and follow the incubator's fascinating rise with this history.

Animals can be sneaky. But do you know who is especially sneaky? Undercover ostriches! They're everywhere, and they're masters at going undetected. You've probably seen one and just assumed it was another woodpecker or owl. The narrator of this book is on the case, following a single ostrich on his many adventures. Not until the final twist does author Joe Kulka let the listeners in on the narrator's true motivation: a peanut collection mission involving undercover elephants.

For decades, the blasts and howls of the electric guitar have been some of the defining sounds of popular music. But more than a century of effort and innovation had to happen before this instrument went electric. Learn about the master craftspeople who created the guitar as we know it, the inventors who figured out how to send guitar notes through amplifiers and give the guitar a bigger sound, and the musicians whose legendary playing put it at the center of rock 'n' roll.

Are you a good teammate? Do you try your best? Do you follow rules and play fair? Explore these and other ways to be a good sport with these fun books! Lola and Lupe take turns going first when playing on the slide, and wait patiently for their turn to use the swings. Pairs with the nonfiction title Playing Fair.

Video games evolved over decades from simple consoles to cutting-edge entertainment in homes and arcades. In the twenty-first century, they've also become some of the world's most popular apps. Find out more about the technological innovations, major players, and controversies that have made video game history. And from the role of game cartridges to the power of the internet, learn how new inventions keep taking gaming to the next level.

Are you ready for a library adventure? Join a group of children as they explore the Dewey decimal system! Search for ghosts in the 100s section, track down everything from costumes to cars in the 300s, and be on the lookout for sports and music in the 700s. By the end of the book, you'll be more than ready to dive into Dewey on your own!

Friends can come in many different colors, shapes, and sizes. Through and simple text, young listeners will discover the many ways to be a friend and how to celebrate all the different kinds of friendships they have.

Niko loves to draw his world: the ring-a-ling of the ice cream truck, the warmth of sun on his face. But no one appreciates his art. Until one day, Niko meets Iris.... This imaginative and tender story explores the creative process, abstract art, friendship, and the universal desire to feel understood.

Felix has just found a tunnel to a land full of trolls! A troll named Calcite is happy to show him around, but the tour ends early when a band of gnomes captures the new friends. That means tiny arrows from tiny bows. The little archers think trolls eat gnomes, but that's silly—trolls eat rocks! Can Felix and Calcite fix this big misunderstanding?

Taking over a rowdy gym class right before winter vacation is not something James Naismith wants to do at all. The last two teachers of this class quit in frustration. The students—a bunch of energetic young men—are bored with all the regular games and activities. Naismith needs something new, exciting, and fast to keep the class happy—or someone's going to get hurt. Saving this class is going to take a genius. Discover the true story of how Naismith invented basketball in 1891 at a school in Springfield, Massachusetts.

Vaccines have been used to safely introduce people's bodies to diseases for centuries, and they save millions of lives each year. By giving people a weakened or dead version of a disease, a vaccine allows the body to develop antibodies which recognize and fight the disease later on. Early vaccinations used dry scabs from smallpox to promote smallpox immunity. Doctors and scientists across nations took and improved the method, developing vaccines for health crises from whooping cough to polio to COVID-19. This history features famous cases and current challenges.

Earth is home to trillions of germs. But for most of human history, people didn't know germs existed! Healers of the past had different ideas about illnesses and their cures. They blamed illnesses on other causes and sometimes tried dangerous treatments. The invention of tools such as the microscope changed everything, allowing doctors and scientists to see germs and study their effects. This vivid history profiles the people who helped discover germs. Discover the ongoing breakthroughs in research—and germs' surprising benefits for safety and sustainable energy.