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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.

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!

Sneakers grew out of efforts to make more durable, more comfortable shoes—and became a major link between sports and fashion. Their sales rose with the popularity of tennis and exploded along with basketball, leading to celebrity endorsements, big-name brands, and continued technological breakthroughs. In the twenty-first century, sneakers are still evolving, along with "sneaker influencer" social media, smart tech, and other hot new trends.

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.

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.

Why should the bright and flashy animals get all of the attention? If you look closely at some seemingly ordinary animals, you may find a colorful surprise. A lizard is brown. A hippo is gray. But wait! The lizard has a blue tongue to scare predators, and the hippo has pink "sweat" that protects it from the sun! Enjoy author Jane Park's rhyming nonfiction text in this playful exploration of animals' hidden colors.

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.

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.

From baseball to tag to cards, every game has rules to follow. Learn how to be a good sport by playing by the rules.

Abolitionists campaigned for freedom for enslaved people. Abolitionists used print materials, passionate speeches, and direct action to disrupt the racist system of slavery. Learn about abolitionist leaders such as Sojourner Truth and Frederick Douglass, setbacks and victories for the movement, and the work abolitionists continue to inspire.

These creepy creatures will make your skin crawl! Learn about blood-sucking leeches, smelly stinkbugs, giant centipedes, and more. See how their disgusting behaviors keep these animals alive.

Discover a jungle of repulsive plants in this gross guide! Learn about a flower that smells like rotting meat, a plant that swallows bugs, leaves that make you itch, and more.

The Civil War began after eleven southern states seceded in order to keep slavery. Discover how enslaved people experienced the war, from serving on the front lines to glimpsing and winning freedom.

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

These gross animals are fleshy, slimy, and deadly! Learn about blood-sucking fish, stinky skunks, scary goblin sharks and more. Discover how disgusting traits help these animals survive.

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.

It’s fitness day in gym class. Dev works hard and tries his best to jump, climb, run, and more.

It's tough to lose, no matter what game you are playing. But that doesn't mean you can't practice being a good sport.

See what it means to play on a team. Practice, play, win, and lose with your teammates.

"Can we sleep in the sukkah?" the son asks his mom. She worries that it will be cold and dark, and that it might rain. “But the stars will be my nightlight,” the boy says, to which the mom smiles.