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 Leaveitt's story will inspire young women and aspiring scientists of all kinds and includes additional information about the solar system and astronomy.

    And, it's true, many of them do. But Paul Erdos never followed the usual path. At the age of four, he could ask you when you were born and then calculate the number of seconds you had been alive in his head. But he didn't learn to butter his own bread until he turned twenty. Instead, he traveled around the world, from one mathematician to the next, collaborating on an astonishing number of publications. With a simple, lyrical text and richly layered illustrations, this is a beautiful introduction to the world of math and a fascinating look at the unique character traits that made "Uncle Paul" a great man.

    At age fourteen, he moved north to Cleveland, where his creative mind took flight amidst the city's booming clothing-manufacturing industry.Using his ingenuity and tenacity, Garrett overcame racial barriers and forged a career as a successful businessman and inventor. But when a tunnel collapsed, trapping twenty men, the rescue would test both Garrett's invention -- and his courage.Told in compelling prose by debut picture-book author Joan DiCicco and dynamic illustrations from artist Ebony Glenn, The Unstoppable Garrett Morgan is a powerful biography of an extraordinary man who dedicated his life to improving the lives of others.

    For years before becoming a justice of the Supreme Court, Ruth had to fight the notion that being female meant that she was less smart, less qualified, and less worthy of attention than her male counterparts. Throughout college, law school, and her work life, she faced discrimination—because she was a woman.But it was in her fight for equality as a lawyer that she made an imprint on American history, by changing the way the law dealt with women's rights and by showing people that unfairness to women wasn’t just a female problem—that it negatively affected men and children, too.

    

    One day, while wandering the ruined streets of Munich, the children follow a line of people entering a building, thinking there may be free food inside. Instead, they are delighted to discover a great hall filled with children's books --- more books than Anneliese can count. Here, they meet the lady with the books, who encourages the children to read as much as they want. And she invites them to come back the next day. Eventually, she will have a greater impact on the children's lives than they could ever have imagined.This moving picture book, written by beloved and award-winning author Kathy Stinson, is based on the real-life work of Jella Lepman, founder of the International Board on Books for Young People (IBBY) and the International Youth Library. Lepman's collection of children's books from around the world traveled throughout Germany after World War II in the hope of building ?bridges of understanding? between countries. Brought to life by highly acclaimed illustrator Marie Lafrance, this book carries an important message about international cooperation that still resonates with world events today. It includes further information about Lepman and her work as well as historical photos. This story of the children who survived the war offers a unique and often unexplored perspective for history lessons. It also makes an excellent choice for character education lessons on resilience. A portion of the author's royalties will be donated to IBBY's Children in Crisis Fund.

    Tutored by her father, the mathematician Theon, Hypatia quickly became an authority in the subjects of mathematics, astronomy, and philosophy. Word spread of her brilliance, and scholars from all over the world journeyed to Alexandria to seek her teachings.

    Capturing an engineer’s creative vision and mind for detail, this fully illustrated picture book biography sheds light on how the American inventor George Ferris defied gravity and seemingly impossible odds to invent the world’s most iconic amusement park attraction, the Ferris wheel.     A fun, fact-filled text by Gibbs Davis combines with Gilbert Ford’s dazzling full-color illustrations to transport readers to the 1893 World’s Fair, where George Ferris and his big, wonderful wheel lifted passengers to the skies for the first time.

    Give me your tired,  your poorYour huddled masses yearning to breathe free...Who wrote these words?  And why? In 1883, Emma Lazarus, deeply moved by an influx of immigrants from Eastern Europe, wrote a sonnet that was to give voice to the Statue of Liberty.  Originally a gift from France to celebrate our shared national struggles for liberty, the Statue, thanks to Emma's poem, slowly came to shape our hearts, defining us as a nation that welcomes and gives refuge to those who come to our shores. This title has been selected as a Common Core Text Exemplar (Grades 4-5, Poetry)

      John wants to be a preacher when he grows up—a leader whose words stir hearts to change, minds to think, and bodies to take action. But why wait? When John is put in charge of the family farm’s flock of chickens, he discovers that they make a wonderful congregation! So he preaches to his flock, and they listen, content under his watchful care, riveted by the rhythm of his voice.

    Schmidt comes a picture book biography of a giant in the struggle for civil rights.Sojourner Truth was born into slavery but possessed a mind and a vision that knew no bounds. So Tall Within traces her life from her childhood through her emancipation to her leadership in the movement for rights for both women and African Americans.

    And he also had some very strong ideas about abolishing slavery, ideas which brought him into close contact with another very visible public figure: Frederick Douglass. Douglass was born a slave but escaped in 1838 and became one of the central figures in the American abolitionist movement.This book offers a glimpse into the unusual friendship between two great American leaders. At a time when racial tensions were high and racial equality was not yet established, Lincoln and Douglass formed a strong bond over shared ideals and worked alongside each other for a common goal.The acclaimed team behind Rosa, winner of the Coretta Scott King Award and a Caldecott Honor book, join forces once more to portray this historic friendship at a unique moment in time.

    When a professor discovered that the homework sent to him under a male pen name came from a woman...nothing stopped Sophie. And when she tackled a math problem that male scholars said would be impossible to solve...still, nothing stopped Sophie.For six years Sophie Germain used her love of math and her undeniable determination to test equations that would predict patterns of vibrations. She eventually became the first woman to win a grand prize from France's prestigious Academy of Sciences for her formula, which laid the groundwork for much of modern architecture (and can be seen in the book's illustrations).Award-winning author Cheryl Bardoe's inspiring and poetic text is brought to life by acclaimed artist Barbara McClintock's intricate pen-and-ink, watercolor, and collage illustrations in this true story about a woman who let nothing stop her.

    At the age of 13 Sidney Kidman ran away from home with only five shillings in his pocket. He went on to become a horse dealer, drover, cattle buyer and bush jockey and he also ran a coach business. Above all, Kidman created a mighty cattle empire of more than a hundred stations, fighting droughts, bushfires, floods and plagues of vermin to do so. His enterprise and courage won him a huge fortune and made him a legend.

    Many people tried to help, but the dog could not be reached. Finally, after two nights and seventy-five miles, the little dog was saved by a ship out in the Baltic Sea. The gallant rescue of the little dog nicknamed Baltic made international news. Mônica Carnesi's simple text and charming watercolor illustrations convey all the drama of Baltic's journey. His story, with its happy ending, will warm readers' hearts. An author's note and map are included.