The Late Middle Ages-the two centuries from c. 1300 to c. 1500 - might seem like a distant era, but students of history are still trying to reach a consensus about how it should be interpreted. Was it an era of calamity or rebirth? Was it still clearly medieval or the period in which humanity took its first decisive steps into modernity? These 24 provocative lectures introduce you to the age's major events, personalities, and developments, and arms you with the essentials you need to form your own ideas about this age of extremes.

The Early Middle Ages-the years from A.D. 650 to 1000-were crucial to Europe's future social and political development. These 24 lectures trace a journey from Scandinavia across northern and central Europe to the farthest reaches of the Byzantine and Islamic empires, providing an exciting new look an era often simply called the "Dark Ages."

At the dawn of the last millennium in the year 1000, Europe was one of the world's more stagnant regions-an economically undeveloped, intellectually derivative, and geopolitically passive backwater, with illiteracy, starvation, and disease the norm for almost everyone.Yet only three centuries later, all of this had changed. A newly invigorated cluster of European societies had revived city life, spawned new spiritual and intellectual movements and educational institutions, and had begun, for reasons both sacred and profane, to expand at the expense of neighbors who traditionally had expanded at Europe's expense.

As raiders and explorers, the Vikings played a decisive role in the formation of Latin Christendom, and particularly of western Europe. Now, in a series of 36 vivid lectures by an honored teacher and classical scholar, you have the opportunity to understand this remarkable race as never before, studying the Vikings not only as warriors, but in all of the other roles in which they were equally extraordinary - merchants, artists, kings, raiders, seafarers, shipbuilders, and creators of a remarkable literature of myths and sagas.

Alexander the Great-one of the most renowned figures in antiquity-has inspired everything from medieval romances to blockbuster movies, and military leaders from Julius Caesar to Napoleon to the U.S. general Norman Schwarzkopf. But who was this great king of Macedon? And why is he so legendary? These 36 spellbinding lectures take you deep inside the world of Alexander to witness the astonishing feats of military genius that made his name renowned for millennia after his death.

Most of us have a limited understanding of the powerful role economics has played in shaping human civilization. This makes economic history - the study of how civilizations structured their environments to provide food, shelter, and material goods - a vital lens through which to think about how we arrived at our present, globalized moment. Designed to fill a long-empty gap in how we think about modern history, these 48 lectures are a comprehensive journey through more than 600 years of economic history.

Language defines us as a species, placing humans head and shoulders above even the most proficient animal communicators. But it also beguiles us with its endless mysteries, allowing us to ponder why different languages emerged, why there isn't simply a single language, how languages change over time and whether that's good or bad, and how languages die out and become extinct.

Following the surge of interest and pride in Celtic identity since the 19th century, much of what we thought we knew about the Celts has been radically transformed. In The Celtic World, discover the incredible story of the Celtic-speaking peoples, whose art, language, and culture once spread from Ireland to Austria. This series of 24 enlightening lectures explains the traditional historical view of who the Celts were, then contrasts it with brand-new evidence from DNA analysis and archeology that totally changes our perspective on where the Celts came from.

Centuries have passed since the last crusader knight laid down his sword, but the Crusades continue to hold sway over our world. Because the Crusades have been so consequential to history, it's essential to understand the context, motivations, and preconditions of these dramatic military campaigns. In doing so, you'll not only get a fresher understanding of the Crusades, you'll discover surprising truths about why (and how) they were fought.

Chemistry and Our Universe: How It All Works is your in-depth introduction to this vital field, taught through 60 engaging half-hour lectures that are suitable for any background or none at all. Covering a year’s worth of introductory general chemistry at the college level, plus intriguing topics that are rarely discussed in the classroom, this amazingly comprehensive course requires nothing more advanced than high-school math. Your guide is Professor Ron B. Davis, Jr., a research chemist and award-winning teacher at Georgetown University.

Throughout history, military engagements have altered the course of historical events. In these 36 dynamic lectures, Professor Aldrete leads you in discovering the military conflicts that have had the greatest impact in shifting the direction of events and defining our world. Across 4,000 years of history, you'll explore nearly 40 key military engagements, from the milestone battles of Western civilization to their counterparts in the Middle East, India, and Asia.

Hardly a day goes by that we don’t hear about someone committing a violent, reprehensible, even evil, act. And each time it happens, before we know anything about the circumstances, we are already sure of one thing: We are nothing like that perpetrator. But how can we be so sure? After all, we are all human. In Understanding the Dark Side of Human Nature, Professor Daniel Breyer takes us on a fascinating philosophical journey into many of the deepest and darkest questions that have engaged humanity for millennia.

Cities of the Ancient World is your opportunity to survey the breadth of the ancient world through the context of its urban development. Taught by esteemed Professor Steven L. Tuck, of Miami University, these 24 eye-opening lectures not only provide an invaluable look at the design and architecture of ancient cities, they also offer a flesh-and-blood glimpse into the daily lives of ordinary people and the worlds they created.

The history of the Romans as they advanced the frontiers of Classical civilization is often told as a story of warfare and conquest-the mighty legions encountering the "barbarians." But this only tells one side of the story.Who were the Celts, Goths, Huns, and Persians met by the Romans as they marched north and east? What were the political, military, and social institutions that made Rome so stable, allowing its power to be wielded against these different cultures for nearly three centuries?

During the 229-year period from 1485 to 1714, England transformed itself from a minor feudal state into what has been called "the first modern society" and emerged as the wealthiest and most powerful nation in the world. Those years hold a huge and captivating story. The English survived repeated epidemics and famines, one failed invasion and two successful ones, two civil wars, a series of violent religious reformations and counter-reformations, and confrontations with two of the most powerful monarchs on earth, Louis XIV of France and Philip II of Spain.