"As the Internet grows more sophisticated, it is creating new threats to democracy. Social media companies such as Facebook can sort us ever more efficiently into groups of the like-minded, creating echo chambers that amplify our views. It's no accident that on some occasions, people of different political views cannot even understand each other. It's also no surprise that terrorist groups have been able to exploit social media to deadly effect. Welcome to the age of #Republic. In this revealing book, Cass Sunstein, the New York Times bestselling author of Nudge and The World According to Star Wars, shows how today's Internet is driving political fragmentation, polarization, and even extremism--and what can be done about it. Thoroughly rethinking the critical relationship between democracy and the Internet, Sunstein describes how the online world creates "cybercascades," exploits "confirmation bias," and assists "polarization entrepreneurs." And he explains why online fragmentation endangers the shared conversations, experiences, and understandings that are the lifeblood of democracy. In response, Sunstein proposes practical and legal changes to make the Internet friendlier to democratic deliberation. These changes would get us out of our information cocoons by increasing the frequency of unchosen, unplanned encounters and exposing us to people, places, things, and ideas that we would never have picked for our Twitter feed. #Republic need not be an ironic term. As Sunstein shows, it can be a rallying cry for the kind of democracy that citizens of diverse societies most need. "--

Catastrophes, whether natural or man-made, that could destroy the human race are often dismissed as alarmist or fanciful, the stuff of science fiction. In fact the risk of such disasters is real, and growing. A collision with an asteroid that might kill a quarter of humanity in 24 hours and the rest soon after; irreversible global warming that might flip, precipitating "snowball earth;" voraciously replicating nanomachines; a catastrophic accident in a particle accelerator that might reduce the earth to a hyperdense sphere 100 meters across; a pandemic of gene-spliced smallpox launched by bioterrorists; even conquest by superintelligent robots-all these potential extinction events, and others, are within the realm of the possible and warrant serious thought about assessment and prevention. They are attracting the concern of reputable scientists--but not of the general public or the nation's policymakers.How should the nation and the world respond to disaster possibilities that, for a variety of psychological and cultural reasons, people find it hard to wrap their minds around? Richard Posner shows that what is needed is a fresh, thoroughly interdisciplinary perspective that will meld the insights of lawyers, economists, psychologists, and other social scientists with those of the physical sciences. Responsibility for averting catastrophe cannot be left either to scientists or to politicians and other policymakers ignorant of science.As in many of his previous books, Posner brings law and the social sciences to bear on a contemporary problem-in this case one of particular urgency. Weighing the risk and the possible responses in each case, Posner shows us what to worry about and what to dismiss, and discusses concrete ways of minimizing the most dangerous risks. Must we yield a degree of national sovereignty in order to deal effectively with global warming? Are limitations on our civil liberties a necessary and proper response to the danger of bioterror attacks? Would investing more heavily in detection and interception systems for menacing asteroids be money well-spent? How far can we press cost-benefit analysis in the design of responses to world-threatening events? Should the institutional framework of science policy be altered? we need educational reform? Is the interface of law and science awry? These are but a few of the issues canvassed in this fascinating, disturbing, and necessary book.

Everybody knows that digital technology has revolutionized our economy and our lifestyles. But how many of us really understand the drivers behind the technology - the significance of going digital; the miniaturization of circuit boards; the role of venture capital in financing the revolution; the importance of research and development? How many of us understand what it takes to make money from innovative technologies? Should we worry about manufacturing going offshore? What is the role of India and China in the digital economy? Drawing on a lifetime's experience in the industry, as an engineer, a senior manager and as a partner in a venture capital firm, Henry Kressel offers an expert personalized answer to all these questions. He explains how the technology works, why it matters, how it is financed and what the key lessons are for public policy.