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.

    Bison? They're banned! Tigers? Taboo! Say good-bye to the gnu, cheerio to the cheetah, and peace to the panda.The world of Lesser Spotted Animals STARTS HERE!Find out all about the amazing animals you need to know but never get to see, from the numbat to the zorilla, and everything in between.

    As they grow, she teaches them how to survive in the wild. Until one day, fox dies. Her body goes back to earth and grass and air, nourishing the world around her and bringing the forest to life. Death is not just an end, it’s also a beginning.Fox: A Circle of Life Story answers the big scientific question: What happens when we die?Bringing together an evocative non-fiction narrative with breath-taking illustrations, this book will help parents and children to talk about life and death. It introduces the scientific concept that death leads to new life, and that this way of understanding the world is no less beautiful and awe-inspiring than traditional stories.Fox: A Circle of Life Story unites story and science to explain this big concept to children who have lost a pet or a loved one, or who simply are curious about death and what happens after we die.

    But after the stock market crashed in 1929, Vivien lost all his savings. Then he heard about a job opening at the Vanderbilt University medical school under the supervision of Dr. Alfred Blalock. Vivien knew that the all-white school would never admit him as a student, but he hoped working there meant he was getting closer to his dream.As Dr. Blalock's research assistant, Vivien learned surgical techniques. In 1943, Vivien was asked to help Dr. Helen Taussig find a cure for children with a specific heart defect. After months of experimenting, Vivien developed a procedure that was used for the first successful open-heart surgery on a child. Afterward, Dr. Blalock and Dr. Taussig announced their innovative new surgical technique, the Blalock-Taussig shunt. Vivien's name did not appear in the report.Overcoming racism and resistance from his colleagues, Vivien ushered in a new era of medicine children's heart surgery. Tiny Stitches is the compelling story of this incredible pioneer in medicine.

    So when Ben and the rest of his family make their way to America, Ben brings both his sharp artistic eye and his desire to fight for what’s right. As he grows, he speaks for justice through his art—by disarming classmates who bully him because he’s Jewish, by defying his teachers’ insistence that he paint beautiful landscapes rather than true stories, by urging the US government to pass Depression-era laws to help people find food and jobs.