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.

    But in every corner of the world this age-old custom is rapidly changing. From increased trade between countries to the expansion of global food corporations like Kraft and Nestlé, current events are having a tremendous impact on our eating habits. Chances are your supermarket is stocking a variety of international foods, and American fast food chains like McDonald’s and Kentucky Fried Chicken are popping up all over the planet. For the first time in history, more people are overfed than underfed. And while some people still have barely enough to eat, others overeat to the point of illness. To find out how mealtime is changing in real homes, authors Peter Menzel and Faith D’Aluisio visited families around the world to observe and photograph what they eat during the course of one week. They joined parents while they shopped at mega grocery stores and outdoor markets, and participated in a feast where a single goat was shared among many families. They watched moms making dinner in kitchens and over cooking fires, and they sat down to eat with twenty-five families in twenty-one countries--if you’re keeping track, that’s about 525 meals! The foods dished up ranged from hunted seal and spit-roasted guinea pig to U.N.-rationed grains and gallons of Coca-Cola. As Peter and Faith ate and talked with families, they learned firsthand about food consumption around the world and its corresponding causes and effects. The resulting family portraits offer a fascinating glimpse into the cultural similarities and differences served on dinner plates around the globe.

    As European immigrants the d'Aulaires felt keenly the importance of standing against injustice, and saw in Lincoln the archetypal American hero as he stood against the injustice of slavery. It was this spirit they hoped to exemplify in their biography of young Abe as he grew into manhood against the backdrop of the wilderness of Kentucky, the deep woods of Indiana, and the prairies of Illinois. Camping for weeks in Lincoln country, the d'Aulaires imbibed the spirit of the man Lincoln as well as his humor and good will. From his days as a clerk, teaching himself law reading Blackstone, practicing law in Springfield, running unsuccessfully for office, debating Stephen Douglas over the issue of slavery, and ultimately becoming President of the United States, the d'Aulaires have written and beautifully illustrated the life of one of America's most remarkable citizens. This book was awarded the Caldecott Medal in 1940.

    Lyrical passages in her wolf pup diary describe how the pups tumble and play and when they first learn to howl and talk wolk talk. Readers are reminded of the changes in nature that are happening in the lower 48 states as they "look to the north" to watch the wolf pups grow. Jean George's words and Lucia Washburn's breathtaking paintings give the reader a rare glimpse of one of nature's noblest creatures: the wolf.

    Sometimes a germ catches up with you.Germs are all around you, but they are too small for you to see. Many germs are harmless, but two kinds, viruses and bacteria, can make you sick. Read and find out about germs, how they can make you sick, and how your body works to fight them off and keep you healthy.

    Beloved children's book author Stacy McAnulty helps Earth tell her story, and award-winning illustrator David Litchfield brings the words to life. The book includes back matter with even more interesting tidbits.

    From dazzling blue lapis lazuli to volcanic snowflake obsidian, an incredible variety of rocks are showcased in all their splendor. Poetic in voice and elegant in design, this book introduces an array of facts, making it equally perfect for classroom sharing and family reading.

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    The Pop-Up Book of Nightmares brings them vividly to life with ten richly illustrated, over-the-top pop-ups that put the reader right in the center of a world gone mad. Which one of these nightmares did you have last night?--Being unprepared for a final exam--Going for a midnight snack and finding a refrigerator teeming with rats--Giving birth to a baby that's anything but normal--Being chased by a menace that seems to be everywhere at once--Free falling with no hope of a safe landingThe Pop-Up Book of Nightmares is the perfect gift for anyone who wants to mine the psychological riches of their deepest slumber.

    What is it like to come face-to-face with the ten-foot-tall terror bird? Or stare into the mouth of the largest meat eater ever to walk the earth? Can you imagine a millipede that is more than six feet long, or a dinosaur smaller than a chicken? In this “actual size” look at the prehistoric world, which includes two dramatic gatefolds, you’ll meet these awe-inspiring creatures, as well as many others.

    Let's-Read-And-Find-Out is the winner of the American Association for the Advancement of Science/Subaru Science Books & Films Prize for Outstanding Science Series.Supports the Common Core Learning Standards and Next Generation Science Standards.

    Through the example of a shared village green and the growing needs of the townspeople who share it, Molly Bang presents the challenge of handling our planet's natural resources. Full color picture book.

    This closeup look at the evolution and behavior of horses, zebras, ponies, mules, and more examines their importance to humans throughout history, and includes photos of all major domestic breeds.

    . . each of these children has hopes and fears, dreams and beliefs. Their cultures are different, yet in many ways their daily lives are very similar, as are their hopes for the future and their ways of looking at the world.Over the past two years, a photographer and a teacher have traveled to more than 30 countries, meeting and interviewing children. Each child's story is recorded in this remarkable book, published to coincide with the 50th anniversary of the United Nations Children's Fund (UNICEF). Extraordinary photographs bring to life the children's families and homes, their clothes and food, their friends and favorite games, and other aspects of their daily lives.The children live in places as diverse as New York, Mongolia, and the Amazon Basin. These are children from both industrialized and developing nations, children from busy cities and remote rural communities, and children from tribal cultures. Their environments include mountains, deserts, rain forests, plains, and polar regions. Most live in families, but Suchart, a novice monk, lives in a monastery, and Tadesse, an Ethiopian boy, lives in an orphanage. Children everywhere will enjoy reading about the lives of these children who share their world.Those who want to make friends with children around the world can join the Children Just Like Me Penpal Club, details of which are included in this book. Part of the Penpal Club membership fee goes to support UNICEF, helping children all over the world.

    In fact, five of them could fit into the period at the end of this sentence.On a clear, warm Sunday, April 14, 1935, a wild wind whipped up millions upon millions of these specks of dust to form a duster—a savage storm—on America's high southern plains.The sky turned black, sand-filled winds scoured the paint off houses and cars, trains derailed, and electricity coursed through the air. Sand and dirt fell like snow—people got lost in the gloom and suffocated . . . and that was just the beginning.Don Brown brings the Dirty Thirties to life with kinetic, highly saturated, and lively artwork in this graphic novel of one of America's most catastrophic natural events: the Dust Bowl.