The only question is when. In the meantime, we need to get much better at finding objects hurtling our way, and if they’re large enough to penetrate the atmosphere without burning up, figure out what to do about them. We owe many of science’s most important discoveries to the famed Meteor Crater, a mile-wide dimple on the Colorado Plateau created by an asteroid hit 50,000 years ago. In his masterfully researched Fire in the Sky, Dillow unpacks what the Crater has to tell us. Prior to the early 1900s, the world believed that all craters—on the Earth and Moon—were formed by volcanic activity. Not so. The revelation that Meteor Crater and others like it were formed by impacts with space objects has led to a now accepted theory about what killed off the dinosaurs, and it has opened up a new field of asteroid observation, which has recently brimmed with urgency. Dillow looks at great asteroid hits of the past and spends time with modern-day asteroid hunters and defense planning experts, including America’s first Planetary Defense Officer. Satellite sensors confirm that a Hiroshima-scale blast occurs in the atmosphere every year, and a smaller, one-kiloton blast every month. While Dillow makes clear that the objects above can be deadly, he consistently inspires awe with his descriptions of their size, makeup, and origins. At once a riveting work of popular science and a warning to not take for granted the space objects hurtling overhead, Fire in the Sky is, above all, a testament to our universe’s celestial wonders.

    In 1969 we even walked on the moon. And yet as late as 2000, the earth’s deepest cave—the supercave—remained undiscovered. This is the story of the men and women who risked everything to find it, earning their place in history beside the likes of Peary, Amundsen, Hillary, and Armstrong. In 2004, two great scientist-explorers are attempting to find the bottom of the world. Bold, heroic American Bill Stone is committed to the vast Cheve Cave, located in southern Mexico and deadly even by supercave standards. On the other side of the globe, legendary Ukrainian explorer Alexander Klimchouk—Stone’s polar opposite in temperament and style, but every bit his equal in scientific expertise, physical bravery, and sheer determination—has targeted Krubera, a freezing nightmare of a supercave in the Republic of Georgia, where underground dangers are compounded by the horrors of separatist war in this former Soviet republic.

    

    Now palaeontologist Charles Pellegrino presents a wealth of new knowledge about the doomed towns – and brings to vivid life the people, their last moments, and the aftermath.The lessons learned from modern scrutiny of that ancient eruption produce disturbing echoes in the present. Dr Pellegrino, who worked at Ground Zero in the aftermath of the 9/11 attack, shares his unique knowledge of the strange physics of volcanic 'downblast' and 'collapse column', drawing a direct link from past to present, and providing readers with a poignant glimpse into the last moments of the 'American Vesuvius'.

    The descriptive text includes information on size, geological period, geographical distribution, and ecology of the animal or plant before it was fossilized. In addition, the book provides lists of Geological Survey offices and major fossil collections, a geological time chart, and a guide to collecting and preserving fossils.

    And this updated edition contains a host of new findings on “Gemstones for Collectors,” additional gems in the “Table of Constants,” and the “double fraction” figures that experts have long wanted—a very special new feature.All the gemstones are treated in their many variations: more than 1,500 full-color photos showcase each precious and semiprecious stone in both its rough, natural, and its polished and cut renditions. Each entry offers complete information on the gemstone’s formation, structure, physical properties, and characteristics, along with the best methods of working, cutting, and polishing it. There are even full treatments of lesser-known gems, from andalusite to vesuvian, and a special section is devoted to rocks as precious stones, including alabaster, onyx, obsidian, and fossils. Organic gem materials are also covered, such as coral, ivory, amber, and pearl. Charts and tables help collectors identify unknown gemstones and check for genuineness.

    In a small Missouri town during the 1920s, Clem is torn between family responsibility and the life he wishes to lead when he must begin working in the local lead mine on his thirteenth birthday, to help pay for his sisters medical care.

    Map of a Nation tells the story of the creation of the Ordnance Survey map - the first complete, accurate, affordable map of the British Isles.

    Yet the man behind what became "America's attic," James Smithson, has remained a shadowy figure for more than 150 years.Drawing on unpublished diaries and letters from across Europe and the United States, historian Heather Ewing tells his compelling story in full. The illegitimate son of the Duke of Northumberland, Smithson was the youngest member of Britain's Royal Society and a talented chemist admired by the greatest scientists of his age. At the same time, however, he was also a suspected spy, an inveterate gambler, and a radical revolutionary during the turbulent years of the Napoleonic Wars. But at the heart of Smithson's story is his bequest—worth $9 million in today in today's currency—which sparked an international lawsuit and a decade-long congressional battle, featuring a dizzying cast of historical figures, including John Quincy Adams, and Alexander Graham Bell, both of whom grappled with how—and even whether—to put Smithson's endowment to use.Fascinating and magisterial, Ewing's biography presents a sweeping portrait of a remarkable man at the center of the English Enlightenment and the creation of America's greatest museum.

    Africa has been coveted for its rich natural resources ever since the era of the Pharaohs. In past centuries, it was the lure of gold, ivory, and slaves that drew merchant-adventurers and conquerors from afar. In modern times, the focus of attention is on oil, diamonds, and other rare earth minerals. In this vast and vivid panorama of history, Martin Meredith follows the fortunes of Africa over a period of 5,000 years. With compelling narrative, he traces the rise and fall of ancient kingdoms and empires; the spread of Christianity and Islam; the enduring quest for gold and other riches; the exploits of explorers and missionaries; and the impact of European colonization. He examines, too, the fate of modern African states and concludes with a glimpse of their future. His cast of characters includes religious leaders, mining magnates, warlords, dictators, and many other legendary figures-among them Mansa Musa, ruler of the medieval Mali empire, said to be the richest man the world has ever known.

    In the winter of 1983, the largest El Niño event on record—a chain of “superstorms” that swept in from the Pacific Ocean—battered the entire West. That spring, a massive snowmelt sent runoff racing down the Colorado River toward the Glen Canyon Dam, a 710-foot-high wall of concrete that sat at the head of the most iconic landscape feature in America, the Grand Canyon. As the water clawed toward the parapet of the dam, worried federal officials desperately scrambled to avoid a worst-case scenario: one of the most dramatic dam failures in history. In the midst of this crisis, beneath the light of a full moon, a trio of river guides secretly launched a small, hand-built wooden boat, a dory named the Emerald Mile, into the Colorado just below the dam’s base and rocketed toward the dark chasm downstream, where the torrents of water released by the dam engineers had created a rock-walled maelstrom so powerful it shifted giant boulders and created bizarre hydraulic features never previously seen. The river was already choked with the wreckage of commercial rafting trips: injured passengers clung to the remnants of three-ton motorboats that had been turned upside down and torn to pieces. The chaos had claimed its first fatality, further launches were forbidden, and rangers were conducting the largest helicopter evacuation in the history of Grand Canyon National Park. An insurgent river run under such conditions seemed to border on the suicidal, but Kenton Grua, the captain of that dory, was on an unusual mission: a gesture of defiance unlike anything the river world had ever seen. His aim was to use the flood as a hydraulic slingshot that would hurl him and two companions through 277 miles of some of the most ferocious white water in North America and, if everything went as planned, catapult the Emerald Mile into legend as the fastest boat ever propelled—by oar, by motor, or by the grace of God—through the heart of the Grand Canyon. Grua himself was already something of a mythic figure, a fearless boatman obsessed with the mysteries of the canyon. His quest embraced not only the trials of the speed run itself but also the larger story of his predecessors: the men who had first discovered the canyon and pioneered its exploration, as well as those who waged a landmark battle to prevent it from being hog-tied by a series of massive hydroelectric dams—a conflict that continues to this day. A writer who has worked as a river guide himself and is intimately familiar with the canyon’s many secrets, Kevin Fedarko is the ideal narrator for this American epic. The saga of The Emerald Mile is a thrilling adventure, as well as a magisterial portrait of the hidden kingdom of white water at the bottom of the greatest river canyon on earth. This book announces Fedarko as a major writing talent and at last sets forth the full story of an American legend—the legend of The Emerald Mile.

    Her career path—hard earned in the male-dominated world of science—has led her into still-flowing Hawaiian lava fields, congressional races, glittering cocktail parties at Manhattan’s elite Explorers Club, and numerous pairs of Caterpillar work boots. It has also inspired her to devote her life to making science more inclusive and accessible.  Ms. Adventure blends personal memoir, daring adventure, and scientific exploration, following Phoenix’s journey from reality television sites deep in Ecuadorian jungles to Andean glaciers, university classrooms to Death Valley in summer.

    Told by a geologist with a novelist's sense of language and narrative, Sand examines the science—sand forensics, the physics of granular materials, sedimentology, paleontology and archaeology, planetary exploration—and at the same time explores the rich human context of sand. Interwoven with tales of artists, mathematicians, explorers, and even a vampire, the story of sand is an epic of environmental construction and destruction, an adventure in staggering scales of time and distance, yet a tale that encompasses the ordinary and everyday. Sand, in fact, is all around us—it has made possible our computers, buildings and windows, toothpaste, cosmetics, and paper, and it has played dramatic roles in human history, commerce, and imagination. In this luminous, kinetic, revelatory account, we do indeed find the world in a grain of sand.

    In 1993, at Volcán Galeras, the death toll was smaller but no less tragic: despite seismic data that foretold possible disaster, an expedition of international scientists proceeded into the volcano. Two hours later, nine people were dead.Expertly detailing the turbulent history of Colombia, Victoria Bruce links together the stories of the heroes, villains, survivors, and victims of these two events. No Apparent Danger is a spellbinding account of clashing cultures and the life-and-death consequences of scientific arrogance.

    Sarah Parcak welcomes you to the exciting new world of space archaeology, a growing field that is sparking extraordinary discoveries from ancient civilizations across the globe. In Archaeology from Space, Sarah Parcak shows the evolution, major discoveries, and future potential of the young field of satellite archaeology. From surprise advancements after the declassification of spy photography, to a new map of the mythical Egyptian city of Tanis, she shares her field’s biggest discoveries, revealing why space archaeology is not only exciting, but urgently essential to the preservation of the world’s ancient treasures.Parcak has worked in twelve countries and four continents, using multispectral and high-resolution satellite imagery to identify thousands of previously unknown settlements, roads, fortresses, palaces, tombs, and even potential pyramids. From there, her stories take us back in time and across borders, into the day-to-day lives of ancient humans whose traits and genes we share. And she shows us that if we heed the lessons of the past, we can shape a vibrant future. Includes Illustrations