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.

    Stunning, realistic illustrations celebrate the beauty of these mysterious creatures as readers learn important facts through an engaging and fascinating story. The book also includes back matter with more in-depth information, a glossary, and further resources.

    / 'Cause whether his or hers amoeba, / They too feel like you and meba.What if a boring lesson about the food chain becomes a sing-along about predators and prey? A twinkle-twinkle little star transforms into a twinkle-less, sunshine-eating-and rhyming Black Hole? What if amoebas, combustion, metamorphosis, viruses, the creation of the universe are all irresistible, laugh-out-loud poetry? Well, you're thinking in science verse, that's what. And if you can't stop the rhymes ... the atomic joke is on you. Only the amazing talents of Jon Scieszka and Lane Smith, the team who created Math Curse, could make science so much fun.

     In January, the cows stay in the barnyard, and the chickens don't lay many eggs. By March, you can tell spring is coming: the barn is filled with baby animals. Month by month, the animals at Maple Hill Farm sense the changing seasons and respond to the changes. Through gently humorous text and charming illustrations, Alice and Martin Provensen capture one year at their beloved Maple Hill Farm in a way sure to delight city slickers and country folk alike.

    With photos, maps, and handwritten notes from Amelia herself—plus informative sidebars tackling everything from the history of flight to what Amelia liked to eat while flying (tomato soup).

    Instead he watches from his balcony. He feels something is coming?something he can?t describe. When he sees the monster wave pulling away from the beach, he knows. Tsunami! But the villagers below can?t see the danger. Will Ojiisan risk everything he has to save them? Can he? Illustrated in stunning collage by Caldecott winner Ed Young, here is the unforgettable story of how one man?s simple sacrifi ce saved hundreds of lives. An extraordinary celebration of both the power of nature and the power each of us holds within.

    But in his mind, he envisions himself traveling at a speed beyond imagining, on a beam of light. This brilliant mind will one day offer up some of the most revolutionary ideas ever conceived. From a boy endlessly fascinated by the wonders around him, Albert Einstein ultimately grows into a man of genius recognized the world over for profoundly illuminating our understanding of the universe. Jennifer Berne and Vladimir Radunsky invite the reader to travel along with Einstein on a journey full of curiosity, laughter, and scientific discovery. Parents and children alike will appreciate this moving story of the powerful difference imagination can make in any life.

    Have you seen her?She's in New York. She's holding a torch. And she's in mid-stride, moving forward. But why?In this fascinating, fun take on nonfiction, Dave Eggers and Shawn Harris investigate a seemingly small trait of America's most emblematic statue. What they find is about more than history, more than art. What they find in the Statue of Liberty's right foot is the message of acceptance that is essential to an entire country's creation.

    Caldecott Honoree and NEW YORK TIMES bestselling author/artist Jon J Muth takes a fresh and exciting new look at the four seasons!Eating warm cookieson a cold dayis easywater catchesevery thrown stoneskip skip splashWith a featherlight touch and disarming charm, Jon J Muth--and his delightful little panda bear, Koo--challenge readers to stretch their minds and imaginations with twenty-six haikus about the four seasons.

     In Elkhorn Slough, an inlet on the California coast, seagrass grows healthy and strong in the shallow water. This healthy seagrass baffled marine biologist Brent Hughes. The scientist expected this estuary to be overrun with algae, causing the seagrass to die. Why was the seagrass thriving? As Brent investigated, signs pointed to an unexpected player helping to keep the seagrass healthy: sea otters! What do these top predators have to do with an aquatic grass at the opposite end of the food chain? Brent's discovery gave scientists insight into the delicate balance of ecosystems. Follow science in action as Brent conducts the research that led to this major discovery.

    Some old-time scientists thought that because they were so big, all they could do was float in water. Boy, were they wrong! Even today, once-common notions about dinosaurs are being revised as new discoveries are made. This lively book about the perennially popular subject of dinosaurs offers fascinating insight into how certain theories were formed, and then how those theories were proved or disproved. It demonstrates that scientific thought is as creative as it is logical and invites budding scientists to come up with their own ideas.

    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."

    With lovely language and a sly sense of humor, this beautiful picture book celebrates the tenacious temperaments of these pesky plants and is sure to have little ones chanting, “Way to go, weeds!”

    But within the past forty years, more than fifty percent of the panda’s already shrinking habitat has been destroyed by humans, leaving the beautiful and beloved giant panda vulnerable to extinction. Despite the seemingly insurmountable odds—poaching, habitat destruction, pollution, human overpopulation, and global climate change—the panda is making a comeback. How? By humans teaching baby pandas how to be wild and stay wild.

    With a double-page spread for each month, this book describes the journey of a single drop of water throughout the year.