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.

    His neighborhood is empty--except for the many cats left behind.Alaa loves Aleppo, but when war comes his neighbors flee to safety, leaving their many pets behind. Alaa decides to stay--he can make a difference by driving an ambulance, carrying the sick and wounded to safety. One day he hears hungry cats calling out to him on his way home. They are lonely and scared, just like him. He feeds and pets them to let them know they are loved. The next day more cats come, and then even more! There are too many for Alaa to take care of on his own. Alaa has a big heart, but he will need help from others if he wants to keep all of his new friends safe.

    Maria Merian was only a child, but she disagreed. She watched carefully as caterpillars spun themselves cocoons, which opened to reveal summer birds, or butterflies and moths. Maria studied the whole life cycle of the summer birds, and documented what she learned in vibrant paintings.This is the story of one young girl who took the time to observe and learn, and in so doing disproved a theory that went all the way back to ancient Greece.

    It was the first trip across an engineering marvel that had taken nearly fourteen years to construct. The woman's husband was the chief engineer, and he knew all about the dangerous new technique involved. The woman insisted she learn as well. When he fell ill mid-construction, her knowledge came in handy. She supervised every aspect of the project while he was bedridden, and she continued to learn about things only men were supposed to know:math,science,engineering.Women weren't supposed to be engineers. But this woman insisted she could do it all, and her hard work helped to create one of the most iconic landmarks in the world. This is the story of Emily Roebling, the secret engineer behind the Brooklyn Bridge, from author-illustrator Rachel Dougherty.

    She set off to fly nonstop from Chicago to New York City. Sitting at the controls of her small bi-plane, exposed to the elements, Law battled fierce winds and numbing cold. When her engine ran out of fuel, she glided for two miles and landed at Hornell, New York. Even though she fell short of her goal, she had broken the existing cross-country distance record. And with her plane refueled, she got back in the air and headed for New York City where crowds waited to greet her. In this well-researched, action-packed picture book, Heather Lang and Raúl Colón recreate a thrilling moment in aviation history. Includes an afterword with archival photographs.

    But he didn’t write stories; he wrote lists. Peter took his love for words and turned it to organizing ideas and finding exactly the right word to express just what he thought. His lists grew and grew, eventually turning into one of the most important reference books of all time.

    . . or could he?Even after seeing Hans answer questions correctly, some people thought it must be a hoax. Scientists began to investigate. Eventually, one scientist had a groundbreaking "aha!" moment and realized Hans was clever in a way no one had even imagined.Turns out Hans was so smart, he changed science!

    His family had been musicians, or bachs as they were called in Germany, for 200 years. He always wanted to be a bach. As he grew, he saw patterns in everything. Patterns he would turn into melodies and song, eventually growing into one of the most important and celebrated musical composers of all time. This is the story of Johann Sebastian Bach.

    As a child, she daydreamed about beats and lyrics, and hummed along with the music from her family's Majestic radio. At age seven, Melba fell in love with a big, shiny trombone, and soon taught herself to play the instrument. By the time she was a teenager, Melba's extraordinary gift for music led her to the world of jazz. She joined a band led by trumpet player Gerald Wilson and toured the country. Overcoming obstacles of race and gender, Melba went on to become a famed trombone player and arranger, spinning rhythms, harmonies, and melodies into gorgeous songs for all the jazz greats of the twentieth century: Randy Weston, Duke Ellington, Count Basie, Billie Holiday, and Quincy Jones, to name just a few. Brimming with ebullience and the joy of making music, Little Melba and Her Big Trombone is a fitting tribute to a trailblazing musician and a great unsung hero of jazz.

    B. White, beloved author of Charlotte's Web and Stuart Little, written by Barbara Herkert and illustrated by Caldecott honoree Lauren Castillo.When young Elwyn White lay in bed as a sickly child, a bold house mouse befriended him. When the time came for kindergarten, an anxious Elwyn longed for the farm, where animal friends awaited him at the end of each day. Propelled by his fascination with the outside world, he began to jot down his reflections in a journal. Writing filled him with joy, and words became his world.Today, Stuart Little and Charlotte’s Web are beloved classics of children’s literature, and E. B. White is recognized as one of the finest American writers of all time.A Christy Ottaviano Book

     Three-year-old Albie has never said a single word. When his worried mother and father consult a doctor, he advises them to expose little Albie to new things: a trip to the orchestra, an astronomy lecture, a toy boat race in the park. But though Albie dances with excitement at each new experience, he remains silent. Finally, the thoughtful, quiet child witnesses something so incredible, he utters his very first word: “Why?” Kids, parents, and teachers will be delighted and reassured by this joyous story of a child who develops a bit differently than others."More than a distinctive introduction to Albert Einstein, this book promotes both understanding of difference and scientific curiosity." —Kirkus Reviews, Starred

    His popular TV series brought whales, otters, and dolphins right into people s living rooms. Now, in this exciting picturebook biography, Dan Yaccarino introduces young readers to the man behind the snorkel. From the first moment he got a glimpse of what lived under the ocean s waves, Cousteau was hooked. And so he set sail aboard the Calypso to see the sea. He and his team of scientists invented diving equipment and waterproof cameras. They made films and televisions shows and wrote books so they could share what they learned. The oceans were a vast unexplored world, and Cousteau became our guide. And when he saw that pollution was taking its toll on the seas, Cousteau became our guide in how to protect the oceans as well."

    She would use it to make everyone happy, to erase the smell of garbage from her city, to sleep an extra hour in the morning. But as she grew older, Malala saw that there were more important things to wish for. She saw a world that needed fixing. And even if she never found a magic pencil, Malala realized that she could still work hard every day to make her wishes come true. This beautifully illustrated volume tells Malala's story for a younger audience and shows them the worldview that allowed Malala to hold on to hope even in the most difficult of times.

    Whir. Buzz.Not so long ago, math problems had to be solved with pencil and paper, mail delivered by postman, and files were stored in paper folders and metal cabinets. But three women, Betty Snyder, Jean Jennings, and Kay McNulty knew there could be a better way. During World War II, people hoped ENIAC (Electronic Numerical Integrator and Computer), one of the earliest computers, could help with the war effort. With little guidance, no instructions, and barely any access to the machine itself, Betty, Jean, and Kay used mathematics, electrical engineering, logic, and common sense to command a computer as large as a room and create the modern world. The machine was like Betty, requiring outside-the-box thinking, like Jean, persistent and consistent, and like Kay, no mistakes, every answer perfect. Today computers are all around us, performing every conceivable task, thanks, in large part, to Betty, Jean, and Kay's pioneering work. Instructions Not Included is their story.This fascinating chapter in history is brought to life with vivid prose by Tami Lewis Brown and Debbie Loren Dunn and with striking illustrations by Chelsea Beck. Detailed back matter including historical photos provides a closer look.

    Goode was one of the first African-American women to get a U.S. patent. Working in her furniture store, she recognized a need for a multi-use bed and through hard work, ingenuity, and determination, invented her unique cupboard bed. She built more than a piece of furniture. She built a life far away from slavery, a life where her sweet dreams could come true.