Railways are one of the most important inventions in modern history. From the 1825 opening of the Stockton and Darlington Railway in England, trains revolutionized both travel and trade and radically changed the way we experience the world. In the 24 richly illustrated lectures of How Railways Transformed the World, you’ll experience the amazing world and impact of railways, from the early 19th century to today’s futuristic trains, including extensive material on the pleasure and appeal of rail travel today.

The promise of America is that the country is based on an idea, one where everyone is created equal and equally free to chart their own course. From 13 newly independent states ratifying a national constitution to the heated debates in the halls of Congress today, American politics is about negotiation over what our country is—and where we are going.

Thought experiments are “what if” scenarios that invite us to look carefully at how we think and view the world. They’ve been used throughout history by philosophers and other thinkers to explore our intuitions and ways of reasoning, to find solutions to problems, and to expand our knowledge of ourselves and the world. In these 24 eye-opening lectures, Professor Breyer takes you deeply into the historical tradition of thought experiments, shining a light on both the purpose and the outcomes of these compelling mental voyages.

Heidi Sormaz has a PhD in psychology from Yale University with an emphasis on cognitive psychology, and she’s been a meditation and yoga practitioner and teacher for two decades. She is also a reformed over-thinker, so, she knows exactly what you’re going through—or what you’re (over)thinking, so to speak. Over the 12 engaging lessons of Overcome Your Overthinking, Heidi not only provides the science behind cognitive behavioral therapy but she’ll also arm you with a toolbox of exercises and techniques that are most effective at breaking the spell of overthinking.

Though it ended five centuries ago, the medieval era continues to permeate our world in far-reaching ways. Whether we pay attention to them or not, the influences and imprints of the Middle Ages are all around us, sometimes evident and sometimes less so. In these 36 revealing lectures, you’ll learn how to recognize the medieval impacts on the modern world, and to grasp their significance and implications. The Medieval Legacy offers you a deep look at a stunning millennium of change and innovation which continues to inform our contemporary world.