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The Invisible Pyramid
by Loren C. EiseleyThis collection of essays, first published shortly after Americans landed on the moon, explores inner and outer space, the vastness of the cosmos, and the limits of what can be known.
The Invisible Pyramid: A Library of America eBook Classic
by Loren Eiseley William CrononTo read Loren Eiseley is to renew a sense of wonder at the miracles and paradoxes of evolution and the ever-changing diversity of life. In this brilliant collection he considers the cosmological significance and ultimate meanings of our evolutionary history, offering a series of profound, lyrical meditations on the origins and possible futures of humankind against the backdrop of the Apollo landings. As Western civilization attains new heights of scientific awareness and technological skill, he asks, is it also blind to its own limits and destructive capacities? Always a fond observer of the natural world, Eiseley makes a newly urgent, environmentalist plea in The Invisible Pyramid: we must protect the fragile "world island" against our unchecked power to pollute and consume it.
The Invisible Siege: The Rise of Coronaviruses and the Search for a Cure
by Dan Werb&“A journey into the origins of COVID-19 and the discovery of vaccines and potential cures . . . I learned so much that I didn&’t know before—above all, I met the subtle warriors of the laboratory who are working to save all of us from the horror of new pandemics.&”—Richard Preston, bestselling author of The Hot Zone and The Demon in the Freezer One of Publishers Weekly&’s top ten science books of the season The urgency of the devastating COVID-19 pandemic has fixed humanity&’s gaze on the present crisis. But the story of this pandemic extends far further back than many realize. In this engrossing narrative, epidemiologist Dan Werb traces the rising threat of the coronavirus family and the attempts by a small group of scientists who worked for decades to stop a looming viral pandemic.When virologist Ralph Baric began researching coronaviruses in the 1980s, the field was a scientific backwater—the few variants that infected humans caused little more than the common cold. But when a novel coronavirus sparked the 2003 SARS epidemic, and then the MERS epidemic a decade later, Baric and his allies realized that time was running out before a pandemic strain would make the inevitable jump from animals to human hosts.In The Invisible Siege, Werb unpacks the dynamic history and microscopic complexity of an organism that has wreaked cycles of havoc upon the world for millennia. Elegantly tracing decades of scientific investigation, Werb&’s book reveals how Baric&’s team of scientists hatched an audacious plan not merely to battle COVID-19 but to end pandemics forever. Yet as they raced to find a cure, they ran into a complicated nexus of science, ethics, industry, and politics that threatened to derail their efforts just as COVID-19 loomed ever larger.The Invisible Siege is an urgent and moving testament to the unprecedented scientific movement to stop COVID-19—and a powerful look at the infuriating factors that threaten to derail discovery and leave the world vulnerable to the inevitable coronaviruses to come.
The Invisible Universe
by Gerrit VerschuurHidden from human view, accessible only to sensitive receivers attached to huge radio telescopes, the invisible universe beyond our senses continues to fascinate and intrigue our imaginations. Closer to home, in the Milky Way galaxy, radio astronomers listen patiently to the ticking of pulsars that tell of star death and states of matter of awesome densities. All of this happens out there in the universe hidden from our eyes, even when aided by the Hubble Space Telescope. This is the story of radio astronomy, of how radio waves are generated by stars, supernova, quasars, colliding galaxies and by the very beginnings of the universe itself. The author discusses what radio astronomers are doing in the New Mexico desert, in a remote valley in Puerto Rico, and in the green Pocahontas Valley in West Virginia, as well as dozens of other remote sites around the world. With each of these observatories, the scientists collect and analyze their data, "listening" to the radio signals from space in order to learn what, or perhaps who, is out there as well. The author specifically highlights enormous changes that have occurred in the field over the past 50 years, including the political reality of radio astronomy and what that could mean for the future.
The Invisible Universe: Why There's More to Reality than Meets the Eye
by Matthew BothwellFrom the discovery of entirely new kinds of galaxies to a window into cosmic &‘prehistory&’, Bothwell shows us the Universe as we&’ve never seen it before – literally. Since the dawn of our species, people all over the world have gazed in awe at the night sky. But for all the beauty and wonder of the stars, when we look with just our eyes we are seeing and appreciating only a tiny fraction of the Universe. What does the cosmos have in store for us beyond the phenomena we can see, from black holes to supernovas? How different does the invisible Universe look from the home we thought we knew? Dr Matt Bothwell takes us on a journey through the full spectrum of light and beyond, revealing what we have learned about the mysteries of the Universe. This book is a guide to the ninety-nine per cent of cosmic reality we can&’t see – the Universe that is hidden, right in front of our eyes. It is also the endpoint of a scientific detective story thousands of years in the telling. It is a tour through our Invisible Universe.
The Invisible World: Early Modern Philosophy and the Invention of the Microscope (Studies in Intellectual History and the History of Philosophy #2)
by Catherine WilsonIn the seventeenth century the microscope opened up a new world of observation, and, according to Catherine Wilson, profoundly revised the thinking of scientists and philosophers alike. The interior of nature, once closed off to both sympathetic intuition and direct perception, was now accessible with the help of optical instruments. The microscope led to a conception of science as an objective, procedure-driven mode of inquiry and renewed interest in atomism and mechanism. Focusing on the earliest forays into microscopical research, from 1620 to 1720, this book provides us with both a compelling technological history and a lively assessment of the new knowledge that helped launch philosophy into the modern era. Wilson argues that the discovery of the microworld--and the apparent role of living animalcula in generation, contagion, and disease--presented metaphysicians with the task of reconciling the ubiquity of life with human-centered theological systems. It was also a source of problems for philosophers concerned with essences, qualities, and the limits of human knowledge, whose positions are echoed in current debates about realism and instrument-mediated knowledge. Covering the contributions of pioneering microscopists (Leeuwenhoek, Swammerdam, Malpighi, Grew, and Hooke) and the work of philosophers interested in the microworld (Bacon, Descartes, Leibniz, Malebranche, Locke, and Berkeley), she challenges historians who view the abstract sciences as the sole catalyst of the Scientific Revolution as she stresses the importance of observational and experimental science to the modern intellect.
The Ionian Sea Encyclopedia (Encyclopedia of Seas)
by Igor S. ZonnThe book is dedicated to the Ionian Sea, which is part of the Mediterranean. The encyclopedia contains about 600 articles on the hydrographic and geographic objects, hydrological features of the sea, biological resources, as well as administrative-territorial units of the Ionian countries. The most significant natural objects like islands, peninsulas, bays, rivers, mountains, their geographical peculiarities are briefly described as well as economy, culture and history, cities, ports, international agreements, research institutions, activities of outstanding scientists, researchers, travelers are presented in the publication. The chronology of the main historical events that have become significant landmarks in the history of discovery and exploration of the Ionian Sea from the 31 B.C. to the present day is given.
The Ionosphere with GNSS SDR: Specialized Software-Defined Radio for In-Depth Ionospheric Research (Springer Atmospheric Sciences)
by Ivan G. Petrovski IIThis comprehensive volume navigates through the complexities of Earth's ionosphere and its intricate relationship with GNSS spread-spectrum signals. The book delineates the nuanced structures and dynamics of Earth's atmosphere, offering profound insights into signal propagation, including a meticulous analysis of various ionospheric models. Delving into the instruments of choice, it encapsulates the facets of the GNSS space segment, its theoretical background, and practical applications. The ground and user segments discussed provide readers with a deep understanding of satellite dynamics and navigation data. Further chapters explore the intricacies of GNSS Software Defined Radio (SDR), offering a detailed examination of signal acquisition and tracking, and presenting innovative approaches to baseband data application without data decoding. A significant portion is devoted to manufacturing front-end hardware, providing guidance from specifications to testing, enabling readers to navigate the world of hardware design with ease. Lastly, the book ventures into the applications of GNSS receivers for ionospheric study, highlighting the construction of advanced observables and their practical applications in navigation processors. This section also elucidates the role of multi-station observables in extracting critical ionospheric information. A pivotal resource for researchers and professionals alike, this book stands as a testament to comprehensive research and innovation in the field of GNSS and SDR, fostering a deeper understanding of the Earth's ionosphere. This book serves as a natural progression from Dr.Petrocski's prior contributions, offering readers actionable insights grounded in theoretical understanding.
The Iranian Space Endeavor
by Parviz TarikhiProvides a detailed look at the events and policies surrounding the Iranian space endeavor. For those who see the trend of progress and movement of the Iranian space endeavor from the outside, it can be difficult to understand what goes on behind the scenes. However, for one who observes these events firsthand, they take on a very different meaning. In this book, the author brings new and different profiles of Iran's space endeavor to light. Iran claims to be the ninth leading country in the world capable of manufacturing satellites and launching them, plans to land an astronaut on the Moon within a decade, and says its own president plans to be the first Iranian astronaut to travel into space. The author explains in this book that not all of these claims are quite as they seem. In addition to technical explanations, the book also includes historical, legal, social and cultural aspects of Iran's space program as well. It is the author's goal to create a tangible feeling of Iran's space endeavor for the readers.
The Ire of Iron Claw
by James Hamilton Kersten HamiltonSomeone is smuggling secrets out of the Kennewicketts' lab and sabotaging their experiments, putting everyone at the Amazing Automated Inn at risk. In pursuit of the villains, the family of scientific geniuses board their dirigible and take to the skies. Together with their robotic staff and the inventor Nikola Tesla, they must face murderous sky pirates, cross the Alps in a giant mechanical spider, and defy the perilous pigeon Iron Claw and the malevolent magician Madini once more. Will boy inventor Wally and his daring dog, Noodles, be able to defeat the evil Mesmers and their minions a second time? History and technology collide in this fast-paced series narrated by a daring dachshund and brimming with mad science.
The Iron Triangle of Energy: How to Improve Energy Cost, Reliability, & Emissions (River Publishers Series in Energy Management)
by Ronald L. Miller"The Iron Triangle of Energy" explores the intricate balance between cheap, reliable, and clean energy. In a world of trade-offs, this book provides rational ideas to optimize energy choices. With a focus on education and mentoring, it equips consumers, students, industry, and government with the knowledge needed to make informed decisions for our future. Rich with pertinent graphs, it offers a clear understanding of key energy issues.
The Iron: Research History and Role in Chemical Analysis (SpringerBriefs in Molecular Science)
by Kevin C. de BergThis Brief presents an historical investigation into the reaction between ferric ions and thiocyanate ions, which has been viewed in different ways throughout the last two centuries. Historically, the reaction was used in chemical analysis and to highlight the nature of chemical reactions, the laws of chemistry, models and theories of chemistry, chemical nomenclature, mathematics and data analysis, and instrumentation, which are important ingredients of what one might call the nature of chemistry. Using the history of the iron(III) thiocyanate reaction as a basis, the book’s main objective is to explore how chemistry develops its own knowledge base; how it assesses the reliability of that base; and how some important tools of the trade have been brought to bear on a chemical reaction to achieve understanding, a worthwhile goal of any historical investigation.
The Irony of Modern Catholic History: How the Church Rediscovered Itself and Challenged the Modern World to Reform
by George WeigelA powerful new interpretation of Catholicism's dramatic encounter with modernity, by one of America's leading intellectualsThroughout much of the nineteenth century, both secular and Catholic leaders assumed that the Church and the modern world were locked in a battle to the death. The triumph of modernity would not only finish the Church as a consequential player in world history; it would also lead to the death of religious conviction. But today, the Catholic Church is far more vital and consequential than it was 150 years ago. Ironically, in confronting modernity, the Catholic Church rediscovered its evangelical essence. In the process, Catholicism developed intellectual tools capable of rescuing the imperiled modern project. A richly rendered, deeply learned, and powerfully argued account of two centuries of profound change in the church and the world, The Irony of Modern Catholic History reveals how Catholicism offers twenty-first century essential truths for our survival and flourishing.
The Irrational Ape: Why Flawed Logic Puts us all at Risk and How Critical Thinking Can Save the World
by David Robert Grimes'A beautifully reasoned book about our own unreasonableness' Robin Ince Why did revolutionary China consider the sparrow an 'animal of capitalism' - and what happened when they tried to wipe them out? With a cast of murderous popes, snake-oil salesmen and superstitious pigeons, find out why flawed logic puts us all at risk, and how critical thinking can save the world. It may seem a big claim, but knowing how to think clearly and critically has literally helped save the world. In September 1983, at the height of the Cold War, the Soviet Union's early warning system showed five US missiles heading towards the country. Stanislaw Petrov knew his duty: he was to inform Moscow that nuclear war had begun, so that they could launch an immediate and devastating response. Instead, he made a call to say the system was faulty. He'd assessed the situation and reasoned that an error was more likely than such a limited attack. We may not have to save the planet from nuclear annihilation, of course, but our ability to think critically has never been more important. In a world where fake news, mistrust of experts, prejudice and ignorance all too often hold sway, we can all too easily be misled over issues such as vaccinations, climate change or conspiracy theories. We live in an era where access to all the knowledge in the world is at our fingertips, yet that also means misinformation and falsehoods can spread further and faster than ever before. In The Irrational Ape, David Robert Grimes shows how we can be lured into making critical mistakes or drawing false conclusions, and how to avoid such errors. Given the power of modern science and the way that movements can unite to protest a cause via social media, we are in dangerous times. But fortunately, we can learn from our mistakes, and by critical thinking and scientific method we can discover how to apply these techniques to everything from deciding what insurance to buy to averting global disaster. This book, packed with fascinating case studies and examples, helps ensure we are ready for the modern world.
The Irresistible Attraction of Gravity: A Journey to Discover Black Holes
by Luciano RezzollaThe mystery of gravity has captivated us for centuries. But what is gravity and how does it work? This engaging book delves into the bizarre and often counter-intuitive world of gravitational physics. Join distinguished astrophysicist Professor Luciano Rezzolla on this virtual journey into Einstein's world of gravity, with each milestone presenting ever more fascinating aspects of gravitation. Through gentle exposure to concepts such as spacetime curvature and general relativity, you will discover some of the most curious consequences of gravitational physics, such as black holes, neutron stars and gravitational waves. The author presents and explains one of the most impressive scientific achievements of recent times: the first image of a supermassive black hole. Written by one of the key scientists involved in producing these results, you'll get a behind-the-scenes view of how the image was captured and discover what happens to matter and light near a black hole.
The Isaac Newton School of Driving: Physics and Your Car
by Barry ParkerFor some people, driving is an art; for others, it's a science. At the Isaac Newton School of Driving, though, every car is a laboratory on wheels and every drive an exciting journey into the world of physics. As explained by renowned science writer and physics professor Barry Parker—whose father was a car mechanic and garage owner—almost every aspect of driving involves physics. A car's performance and handling relies on fundamental concepts such as force, momentum, and energy. Its ignition system depends on the principles of electricity and magnetism. Braking relies on friction—yet another basic scientific concept—and if the brakes fail, the resulting damage, too, can be predicted using physics.Parker's first lesson describes the basic physics of driving: speed and acceleration; why you get thrown forward while braking or outward while turning; and why car advertisements boast about horsepower and torque. He goes on to discuss the thermodynamics of engines, and how they can be more fuel efficient; and what friction and traction are and how they keep a car's tires on the road, whether it's dry, wet, or icy. He also describes how simple laws of physics enable scientists to design aerodynamic cars and high-tech steering systems. Parker then explores the high-performance physics of auto racing, outlines how traffic accidents are reconstructed by police, uses chaos theory to explain why traffic jams happen, and describes what cars of the future might look like. Whether you drive a Pacer or a Porsche, The Isaac Newton School of Driving offers better—and better-informed—driving through physics.
The Ischemic Penumbra (Neurological Disease and Therapy)
by Anand AkhilaThe Ischemic Penumbra presents the current status of concepts and research on this topic and identifies the latest methods for clinicians to quickly and efficiently recognize viable cerebral tissue for enhanced stroke management. Focusing on state-of-the-science technologies and current trends, the book examines imaging strategies utilizing PET, SP
The Island of Knowledge: The Limits of Science and the Search for Meaning
by Marcelo GleiserWhy discovering the limits to science may be the most powerful discovery of all How much can we know about the world? In this book, physicist Marcelo Gleiser traces our search for answers to the most fundamental questions of existence, the origin of the universe, the nature of reality, and the limits of knowledge. In so doing, he reaches a provocative conclusion: science, like religion, is fundamentally limited as a tool for understanding the world. As science and its philosophical interpretations advance, we face the unsettling recognition of how much we don’t know. Gleiser shows that by abandoning the dualistic model that divides reality into the known and the unknown, we can embark on a third way based on the acceptance of our limitations. Only then, he argues, will we be truly able to experience freedom; for to be free in an age of science we cannot turn science into a god. Gleiser ultimately offers an uplifting exploration of humanity’s longing to conquer the unknown, and of science’s power to transform and inspire.
The Island of the Colorblind
by Oliver SacksOliver Sacks has always been fascinated by islands--their remoteness, their mystery, above all the unique forms of life they harbor. For him, islands conjure up equally the romance of Melville and Stevenson, the adventure of Magellan and Cook, and the scientific wonder of Darwin and Wallace. Drawn to the tiny Pacific atoll of Pingelap by intriguing reports of an isolated community of islanders born totally color-blind, Sacks finds himself setting up a clinic in a one-room island dispensary, where he listens to these achromatopic islanders describe their colorless world in rich terms of pattern and tone, luminance and shadow. And on Guam, where he goes to investigate the puzzling neurodegenerative paralysis endemic there for a century, he becomes, for a brief time, an island neurologist, making house calls with his colleague John Steele, amid crowing cockerels, cycad jungles, and the remains of a colonial culture. The islands reawaken Sacks' lifelong passion for botany--in particular, for the primitive cycad trees, whose existence dates back to the Paleozoic--and the cycads are the starting point for an intensely personal reflection on the meaning of islands, the dissemination of species, the genesis of disease, and the nature of deep geologic time. Out of an unexpected journey, Sacks has woven an unforgettable narrative which immerses us in the romance of island life, and shares his own compelling vision of the complexities of being human.
The Island of the Colorblind
by Oliver SacksOliver Sacks has always been fascinated by islands--their remoteness, their mystery, above all the unique forms of life they harbor. For him, islands conjure up equally the romance of Melville and Stevenson, the adventure of Magellan and Cook, and the scientific wonder of Darwin and Wallace.Drawn to the tiny Pacific atoll of Pingelap by intriguing reports of an isolated community of islanders born totally color-blind, Sacks finds himself setting up a clinic in a one-room island dispensary, where he listens to these achromatopic islanders describe their colorless world in rich terms of pattern and tone, luminance and shadow. And on Guam, where he goes to investigate the puzzling neurodegenerative paralysis endemic there for a century, he becomes, for a brief time, an island neurologist, making house calls with his colleague John Steele, amid crowing cockerels, cycad jungles, and the remains of a colonial culture.The islands reawaken Sacks's lifelong passion for botany--in particular, for the primitive cycad trees, whose existence dates back to the Paleozoic--and the cycads are the starting point for an intensely personal reflection on the meaning of islands, the dissemination of species, the genesis of disease, and the nature of deep geologic time. Out of an unexpected journey, Sacks has woven an unforgettable narrative which immerses us in the romance of island life, and shares his own compelling vision of the complexities of being human.From the Hardcover edition.
The Islets of Langerhans
by Md. Shahidul IslamThis book is a unique and thoughtful blend of critical background information and advances made in a multitude of areas of contemporary islet research. It is an essential reference book, the first of its kind in many years, for professionals as well as for the beginners interested in the study of islet physiology and diabetes. The book is unique in its breadth: it deals with anatomy, histology, ultra-structure, evolution and comparative anatomy, imaging, developmental biology, programming, apoptosis, mitochondrial function, metabolism, cellular signaling, electrophysiology, oscillation of hormone secretion, islets of model animals, immunology, proteomics, regenerative medicine, clinical advances, islet transplantation, and finally islet tumors. Individual chapters contributed by over a hundred experts and enthusiasts, not only provide a balanced view of the recent advances made in the respective fields, but also provide directions and thoughts for future research. Thanks to vivid and colorful illustrations, tables and sketches, the book as a whole, and the individual chapters make reading a pleasant experience. It is a valuable compilation that one would love to possess personally and buy as a present to a colleague.
The Isogeometric Boundary Element Method (Lecture Notes in Applied and Computational Mechanics #90)
by Gernot Beer Benjamin Marussig Christian DuenserThis book discusses the introduction of isogeometric technology to the boundary element method (BEM) in order to establish an improved link between simulation and computer aided design (CAD) that does not require mesh generation. In the isogeometric BEM, non-uniform rational B-splines replace the Lagrange polynomials used in conventional BEM. This may seem a trivial exercise, but if implemented rigorously, it has profound implications for the programming, resulting in software that is extremely user friendly and efficient. The BEM is ideally suited for linking with CAD, as both rely on the definition of objects by boundary representation. The book shows how the isogeometric philosophy can be implemented and how its benefits can be maximised with a minimum of user effort. Using several examples, ranging from potential problems to elasticity, it demonstrates that the isogeometric approach results in a drastic reduction in the number of unknowns and an increase in the quality of the results. In some cases even exact solutions without refinement are possible. The book also presents a number of practical applications, demonstrating that the development is not only of academic interest. It then elegantly addresses heterogeneous and non-linear problems using isogeometric concepts, and tests them on several examples, including a severely non-linear problem in viscous flow. The book makes a significant contribution towards a seamless integration of CAD and simulation, which eliminates the need for tedious mesh generation and provides high-quality results with minimum user intervention and computing.
The Issues and Discussion of Modern Concrete Science
by Wenke YangThis book is devoted to two primary objectives. The first is to present the errors, inadaptability, and mistakes arising when the current theory on concrete is applied to explaining practical construction of concrete; the second is to put forward viewpoints in modern concrete science.Taking a number of engineering cases as examples, we experimentally studied and theoretically analyzed the errors, inadaptability, and mistakes when the current theory on concrete is applied to explaining practical construction of concrete. Moreover, we investigated the use of mixing ratios, aggregates, cement, high-performance concrete and fibers, as well as the frost resistance, cracking behavior, durability, dry shrinkage and autogenous healing to address and remedy the shortcomings in today’s concrete science, put forward new proposals, and make a number of innovative achievements in the field, particularly in modern theory on concrete science. The results and topics which will be of particular interest to engineers and researchers include: corrections to several one-sided, even mistaken views on concrete construction in the field and a new theory that can be adopted to improve the durability of concrete projects, to control and improve the implementation quality of concrete projects, and to guide teaching in universities. Wenke Yang is a distinguished senior engineer at China Airport Construction Group Corporation, General Administration of Civil Aviation of China (CAAC).
The Italian Utilities Industry: Success Stories and Future Perspectives
by Andrea GilardoniThis book addresses the fundamental changes that the Italian public utilities sector has undergone in the last two decades. Since the late 1990s, liberalisation and privatisation have replaced state-owned monopolies at both the national and local level, new technologies have created a broad range of new opportunities for power generation and distribution, and a redesigned public policy agenda has brought to the fore a whole set of new priorities. In this fast-changing environment, firms have redrawn their strategies, redesigned their business architectures and models, invested in infrastructure and R&D, taken advantage of growth opportunities at home and abroad, opened up their ownership structure, revised their offerings, and developed a new approach to customers. As a result, a radically altered market structure has emerged. As the sector tackles the overriding challenge of sustainability and energy transition, the book takes stock of such past and ongoing developments through the direct testimonies of various stakeholders: the companies in the energy, water, and waste management sectors that are at the forefront of this sweeping transformation; regulators; financial partners; and management consulting firms. The diversity of perspectives and wealth of information presented make this book a valuable resource for anyone wanting to grasp the direction, intensity and causes of change, as well as the nature of the challenges that lie ahead. This work has been prepared as part of the research activities of the Observatory on Alliances and Strategies in the Pan-European Utility Market, one of Agici’s Research and Advisory units.
The Ixodid Ticks (Acari: Ixodidae) of Southern Africa
by Agustín Estrada-Peña Roy Williams Ivan G. Horak Heloise Heyne G. James Gallivan Arthur M. Spickett J. Dürr BezuidenhoutThis is a comprehensive work summarizing the current state of knowledge of the biology of the hard ticks (Acari: Ixodidae) of Southern Africa (South Africa, Namibia, Botswana, Swaziland, Lesotho and Maputo Province, Mozambique). It provides an overview of the history of tick research in Southern Africa and the evolution of our knowledge of the ticks’ distribution and biology, as well as the methods used to determine tick distribution, abundance and host preference. The morphologies of most of the tick species known to occur in Southern Africa are described and illustrated, and their distributions are described and mapped in relation to the biomes of the region. The known hosts for each tick species are listed, and the tick’s host preferences are discussed. Information on most species life cycle in the laboratory and the field, and their seasonal occurrence, is summarized. The diseases of animals and humans transmitted or caused by each tick species are summarized in relation to tick ecology. Aspects of the biology of the major hosts relevant to tick infestations are described, and extensive tick/host and host/tick lists are provided for each country