For several years, Andrew Marantz, a New Yorker staff writer, has been embedded in two worlds. The first is the world of social-media entrepreneurs, who, acting out of naïvete and reckless ambition, upended all traditional means of receiving and transmitting information. The second is the world of the people he calls "the gate crashers"—the conspiracists, white supremacists, and nihilist trolls who have become experts at using social media to advance their corrosive agenda. Antisocial ranges broadly—from the first mass-printed books to the trending hashtags of the present; from secret gatherings of neo-Fascists to the White House press briefing room—and traces how the unthinkable becomes thinkable, and then how it becomes reality. Combining the keen narrative detail of Bill Buford's Among the Thugs and the sweep of George Packer's The Unwinding, Antisocial reveals how the boundaries between technology, media, and politics have been erased, resulting in a deeply broken informational landscape—the landscape in which we all now live. Marantz shows how alienated young people are led down the rabbit hole of online radicalization, and how fringe ideas spread—from anonymous corners of social media to cable TV to the President's Twitter feed. Marantz also sits with the creators of social media as they start to reckon with the forces they've unleashed. Will they be able to solve the communication crisis they helped bring about, or are their interventions too little too late?

    Worlds Together, Worlds Apart is organized around major world history stories and themes: the emergence of cities, the building of the Silk Road, the spread of major religions, the spread of the Black Death, the Age of Exploration, alternatives to 19th-century capitalism, the rise of modern nation-states and empires, and more. In the Third Edition, the text has been compressed and streamlined to heighten emphasis on world history stories and themes throughout.

    Even in the age of railways and newspapers, France was a land of ancient tribal divisions, prehistoric communication networks, and pre-Christian beliefs. French itself was a minority language.Graham Robb describes that unknown world in arresting narrative detail. He recounts the epic journeys of mapmakers, scientists, soldiers, administrators, and intrepid tourists, of itinerant workers, pilgrims, and herdsmen with their millions of migratory domestic animals. We learn how France was explored, charted, and colonized, and how the imperial influence of Paris was gradually extended throughout a kingdom of isolated towns and villages.The Discovery of France explains how the modern nation came to be and how poorly understood that nation still is today. Above all, it shows how much of France—past and present—remains to be discovered.

    And yet, disturbingly, in today's so-called information age, pseudoscience is burgeoning with stories of alien abduction, channeling past lives, and communal hallucinations commanding growing attention and respect. As Sagan demonstrates with lucid eloquence, the siren song of unreason is not just a cultural wrong turn but a dangerous plunge into darkness that threatens our most basic freedoms.