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For centuries, people misunderstood how the heart works. As our knowledge grew, heart surgery remained a dangerous medical procedure. Even after organ transplants become common, surgeons struggled to transplant hearts and keep patients alive. But small groups of pioneering doctors attempted this difficult surgery, changing the lives of patients. This history traces their leap forward and the medical world's newest advancements in heart health technology. Learn about innovations such as artificial hearts and 3D-printed living tissue.

Cell phones allowed people to connect on the go, and smartphones have transformed the way we share information. From the earliest landlines to the minicomputers that link people across the world, discover the shifts in phone technology that shaped modern communication—and the people who made them happen. This history also shows the big changes in design, size, and battery life that took place before mobile phones hit the center of popular culture.

Have you ever heard of a prickle of porcupines? Or a tower of giraffes? What about a parcel of penguins? This fun-filled romp through the animal kingdom introduces collective nouns for animals through wordplay. Clever rhymes bring these collective nouns to life in funny ways, making it easy to remember which terms and animals go together. A glossary in the back matter offers further explanation of words used as collective nouns, such as sleuth meaning "detective."

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.

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.

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.

When Angela Haseltine Pozzi found plastic trash polluting the beach near her home, she took action. She formed an organization called Washed Ashore and started gathering trash from beaches and using it to create incredible sculptures of wildlife. These sculptures travel the country to teach people about the importance of these animals—and the problems caused by plastic pollution. Kelly Crull highlights fourteen spectacular sculptures, along with hints to find common objects hidden among the debris. Be inspired to get creative in protecting the world’s oceans!

Meet Willam, Harold, and Lew Christensen, three small-town Utah boys who caught the ballet bug from an uncle in the early 1900s. They performed alongside elephants on vaudeville and even put on a ballet featuring gangsters at a gas station. Russian immigrants shared the story of The Nutcracker with them, and during World War II, they staged their own Christmastime production. It was the beginning of a delightful holiday tradition. Follow along and learn how The Nutcracker came to be performed all across the United States from these truly humble beginnings.

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.

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!

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.

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?

Frankenstein isn't your typical monster. For starters, he only has one head, just two eyes, and no tail. And worst of all, he's sort of nice! Frankenstein quickly realizes his friendly behavior is out of place at the Valentine's Day Bash. There's one monster, though, who likes that Frankenstein is different. Can Frankenstein figure out the identity of his secret valentine? And can the other monsters finally accept Frankenstein for the monster that he is?

Celebrate with the dinos as they gather flowers for a spring bouquet, throw an egg painting party, pet newborn farm animals, visit a chocolate factory, and join an Easter parade with Peter Clobbertail. At last, it's time for the egg hunt. Will Raptor finally get to eat his treats?

Sloths spend most of their lives in trees, and until recently, scientists didn’t know very much about them. But Dr. Rebecca Cliffe was determined to discover their secrets. To find out more, she fitted sloths with special backpacks containing a device to track their activity. She learned how to climb trees in the Costa Rican jungle so she could take sloth hair samples and test their DNA. And she’s helped create sloth crossings and plant trees to ensure the sloths aren’t trapped in shrinking territories. Along the way, she earned the nickname Dr. Sloth.

Hands can wiggle, hands can clap. Hands can wrap and flap and tap. But hands can help—so raise yours, please! Can you guess? Whose hands are these? What if your hands reach, wrench, yank, and crank? The hands in this book—and the people attached to them—do all sorts of helpful work. And together, these helpers make their community a safe and fun place to live. As you listen, keep an eye out for community members who make repeat appearances! Can you guess all the jobs based on the actions of these busy hands?

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.

What does it mean to play fair? Following rules, helping others, and taking turns are just a few examples.

Winning makes us feel good. But when we win, someone else loses. Learn how to be a good winner no matter what game you play.

With the freeing of four million enslaved people after the Civil War, the Reconstruction period brought new victories and challenges in the fight for Black rights. Learn more about this crucial period in US history.