England: From the Fall of Rome to the Norman Conquest takes you through the mists of time to the rugged landscape of the British Isles. Over the course of 24 sweeping lectures, Professor Jennifer Paxton of The Catholic University of America surveys the forging of a great nation from a series of warring kingdoms and migrating peoples. From Germanic tribes to Viking invasions to Irish missionaries, she brings to life an underexamined time and place. 

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.

In this 24-lesson course aimed at non-scientists, noted particle physicist Dr. Don Lincoln of Fermi National Accelerator Laboratory covers more than a century of progress in physics, describing exactly how scientists reach the conclusions they do. He starts with the atom, which was long hypothesized but wasn’t definitively proven until a paper by Albert Einstein in 1905. That was just the beginning, as researchers probed ever deeper into the atom’s complex structure, leading to the weird findings of quantum mechanics.

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.

Since the publication in 1859 of Charles Darwin's remarkable On the Origin of Species, the modern science of biology and genetics has added surprising new dimensions to evolutionary theory. In this course, you’ll discover what Darwin didn’t know, covering much of the curriculum of an introductory college course in evolutionary biology. No background in science is needed to follow these engaging lectures, delivered by Professor Scott Solomon of Rice University, a gifted teacher and widely traveled field biologist.

As the Black Death swept across Europe, killing up to a half of the population in certain areas, a young Geoffrey Chaucer came of age in England. While he and his family avoided the worst of the disease, all were shaped by its presence and impact on the British island. With expert Simon Doubleday, professor of history at Hofstra University, in After the Plague, examine medieval literature like The Canterbury Tales for firsthand accounts from minority voices not typically heard from in the period. 

Some say Charlemagne was a great king, while others believe the many atrocities committed under his reign make him the first in a line of political disasters throughout Europe. This debate has been going on for over a millennium. 

Histories of the United States often overlook the women who shaped the nation. Museums, textbooks, historical sites, and even documentaries omit essential parts of the whole because they leave out her story. Join Allison K. Lange, historian and professor, as she guides you through the fascinating lives of 12 early Americans, all of them women.

Thor, Odin, Loki, Freyja, the Valkyries, Valhalla, Ragnarok — many of the places we encounter these and other names, places, and events from Norse mythology in daily life and pop culture are connected to the medieval sources in name only. 

The world of espionage is shrouded in mystery—even to those in it—but so much of what we think we know about spy craft is rooted in pop culture. Even though the true nature of espionage is quite different, that doesn’t mean history’s real spies are any less heroic, or less fascinating. In these nine episodes, go behind the shadows with a distinguished panel of historians—including a former intelligence case officer—in search of the secret meeting places, complex codes, stealth observations, and cutting-edge technologies spies have used throughout history. 

Trace the growth of communism from Stalin’s consolidation of power to the establishment of communist regimes in Eastern Europe, China, Korea, Vietnam, and elsewhere in Communism in Power: From Stalin to Mao. These 12 half-hour lessons shed intriguing light on a revolutionary movement that played an outsized role in the 20th century and continues to shape 21st-century geopolitics.

Noted Japan expert Professor Mark J. Ravina of the University of Texas at Austin covers the politics, economics, and culture of the island nation since World War II - a conflict that saw the end of Japan’s dream of regional conquest, which Professor Ravina calls Empire 1.0. The country’s postwar leaders radically changed course, renouncing a strong military to pursue Empire 2.0 - Japan as an economic colossus. 

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.

The Roman Empire: From Augustus to the Fall of Rome traces the breathtaking history from the empire’s foundation by Augustus to its Golden Age in the 2nd century CE through a series of ever-worsening crises until its ultimate disintegration. Taught by acclaimed Professor Gregory S. Aldrete of the University of Wisconsin-Green Bay, these 24 captivating lectures offer you the chance to experience this story like never before, incorporating the latest historical insights that challenge our previous notions of Rome’s decline.  

There's an art and science behind how doctors diagnose and treat medical patients. Where do doctors get these skills? The Grand Rounds experience, where they practice how to make accurate diagnoses by examining real patients. And with Dr. Benaroch's 24 unique lectures, you'll explore how a master physician solves medical problems just like a detective.