Henrietta Swan Leavitt was born on July 4, 1868, and she changed the course of astronomy when she was just twenty-five years old. Henrietta spent years measuring star positions and sizes from photographs taken by the telescope at the Harvard College Observatory, where she worked. After Henrietta observed that certain stars had a fixed pattern to their changes, her discovery made it possible for astronomers to measure greater and greater distances—leading to our present understanding of the vast size of the universe.

An astronomer of her time called Henrietta Leavitt “one of the most important women ever to touch astronomy,” and another close associate said she had the “best mind at the Harvard Observatory.” Henrietta Leavitt's story will inspire young women and aspiring scientists of all kinds and includes additional information about the solar system and astronomy.

Best friends Kayla and Mishalla know they will be separated when the time comes for their Assignments. They are GENs, Genetically Engineered Non-humans, and in their strict caste system, GENs are at the bottom rung of society. High-status trueborns and working-class lowborns, born naturally of a mother, are free to choose their own lives. But GENs are gestated in a tank, sequestered in slums, and sent to work as slaves as soon as they reach age fifteen.

When Kayla is Assigned to care for Zul Manel, the patriarch of a trueborn family, she finds a host of secrets and surprises—not least of which is her unexpected friendship with Zul’s great-grandson. Meanwhile, the children that Mishalla is Assigned to care for are being stolen in the middle of the night. With the help of an intriguing lowborn boy, Mishalla begins to suspect that something horrible is happening to them.

After weeks of toiling in their Assignments, mystifying circumstances enable Kayla and Mishalla to reunite. Together they hatch a plan with their new friends to save the children who are disappearing. Yet can GENs really trust humans? Both girls must put their lives and hearts at risk to crack open a sinister conspiracy, one that may reveal secrets no one is ready to face.

“It’s never the disasters you see coming that finally come to pass—it’s the ones you don’t expect at all,” says Julia, in this spellbinding novel of catastrophe and survival by a superb new writer. Luminous, suspenseful, unforgettable, The Age of Miracles tells the haunting and beautiful story of Julia and her family as they struggle to live in a time of extraordinary change.

On an ordinary Saturday in a California suburb, Julia awakens to discover that something has happened to the rotation of the earth. The days and nights are growing longer and longer; gravity is affected; the birds, the tides, human behavior, and cosmic rhythms are thrown into disarray. In a world that seems filled with danger and loss, Julia also must face surprising developments in herself, and in her personal world: divisions widening between her parents; strange behavior by her friends; the pain and vulnerability of first love; a growing sense of isolation; and a surprising, rebellious new strength. With crystalline prose and the indelible magic of a born storyteller, Karen Thompson Walker paints a breathtaking portrait of people finding ways to go on in an ever-evolving world.

Since 2012, the organization Girls Who Code has taught computing skills to and inspired over 40,000 girls across America. Now its founder, and author Brave Not Perfect, Reshma Saujani, wants to inspire you to be a girl who codes! Bursting with dynamic artwork, down-to-earth explanations of coding principles, and real-life stories of girls and women working at places like Pixar and NASA, this graphically animated book shows what a huge role computer science plays in our lives and how much fun it can be. No matter your interest—sports, the arts, baking, student government, social justice—coding can help you do what you love and make your dreams come true. Whether you’re a girl who’s never coded before, a girl who codes, or a parent raising one, this entertaining book, printed in bold two-color and featuring art on every page, will have you itching to create your own apps, games, and robots to make the world a better place.