Everybody knows that. But what is it that pulls everything from rocks to rockets toward the center of the earth? It's gravity. Nobody can say exactly what it is, but gravity is there, pulling on everything, all the time. With the help of an adventurous scientist and his fun-loving dog, you can read and find out about this mysterious force.
You're crouched in the African brush, camera at the ready.You're waiting on one of nature's loners. It's dark. It's scary.Then silently, he appears; the ever-elusive leopard. You haveseconds to capture on film this wonder of the wild, with its exoticspotted fur, so prized by hunters. National GeographicExplorers-in-Residence Dereck and Beverly Joubert take you closerto the mystery of the magnificent leopard and make a passionateplea to young readers to help secure a future for these felinetreasures.
People want their homes to be comfortable and secure, aplace where they can happily raise their children and one dayretire. It's no different in the animal world! There are animalarchitects, animal builders, and even animal squatters — meet themall in 3-D Close Up: Animal Homes! With four awesome pop-upcross sections, this fascinating new book gives young readers achance to do in-depth investigations of some dazzling dwellings —in the trees, in the water, and underground — and meet the amazinganimals that live inside. Kids will love exploring intricate insectcities, squirrels' treetop dreys, a beaver lodge, and theunderground burrow of a meerkat family. Every page is bursting withengaging information, cool close-up photographs, and dramatic,highly detailed illustrations that bring the animal homes vividlyto life.
凯迪克金奖得主大卫麦考利经典科普绘本，这本充满创意的物理世界入门书自出版以来畅销半个世纪，让看似毫不相关的事物有了绝妙的联系。可爱幽默的猛犸将带领我们进入一个迷人的物理世界，它以诙谐的方式描绘了数百种机械运转的原理，展现了物理源于生活的发展历程，从简单的起重机到高科技的网络，尽数囊括其中，文字简单易懂，语言风趣幽默，即使不具备任何科学常识的读者，也能对复杂的物理世界恍然大悟，是激发青少年物理热情的典藏。 What really makes the things around us tick? Did you know that the principle behind the zip fastener also governed the building of the pyramids? Or that the dentist's drill is a direct descendant of the first windmill? The inner workings of hundreds of machines and devices are explained in this fun, colourful and unique look at technology through time.
Ever since 1992, Mary Pope Osborne has been thrilling kidseverywhere with her delightfully exciting Magic Tree House series.The globetrotting escapades of time travelers Jack and Annie arebrimming with adventure and magic (not to mention some subtlyplaced lessons on history and geography). With a life likeOsborne's, it's only natural that she would be capable of bringingsuch wondrous stories to life. Osborne was brought up in a military family, and her parents'work led to a lifestyle marked by constant change. "By the time Iwas 15," she says on randomhouse.com, "I had lived in Oklahoma,Austria, Florida, and four different army posts in Virginia andNorth Carolina." While many kids would probably feel disoriented bysuch constant change, Osborne wouldn't have had it any other way."Moving was never traumatic for me, but staying in one place was.When my dad finally retired to a small town in North Carolina, Inearly went crazy with boredom. I craved the adventure and changingscenery of our military lif
