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.

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.

Sales is not about being pushy, aggressive, or unethical. In fact, you might be surprised to learn that “sales” is about nurturing, solving problems, helping, and building relationships. When you learn the right strategies to sell something, you’ll make your own life better because we are all constantly selling—whether it’s getting a promotion, working on a team project, or even just selecting the restaurant of your choice with friends.

In London in the Time of Dickens, you’ll get the unique opportunity to experience the British capital through the eyes of a literary master whose work is inextricably tied to the city and its rich history. Throughout 12 lectures taught by Professor Lillian Nayder of Bates College, you’ll tour the city of London in a time of rapid transformation through the life and work of Charles Dickens, uncovering the history of the metropolis, while also witnessing the everyday experiences of Londoners from all walks of life as Dickens represents them.

Imagine a Museum of Lost Art. If this imaginary museum contained just the artwork we knew was lost— whether from theft, purposeful destruction, vandalism, war, or the forces of nature—it would still contain more masterpieces than those in all the world’s current museums combined. Imagine that! In Lost Art: The Stories of Missing Masterpieces, art historian Noah Charney guides you through just such an imaginary museum. In 12 fascinating lectures, you will hear the stories behind the theft and/or destruction of some of the world’s most famous pieces of art.

10 interview-based episodes that take ancient designs and applies them to modern lives. Your expert is Prince EA, an artist and inspirational speaker who’s spent the greater part of his career thinking about the ancient world.

The brain is a marvelous and complex organ that takes decades to fully mature, and no stage in that long process is more critical than the one we call the “toddler” years. During this period—from about one year old to three years old—a child transforms from a helpless infant into a running, chatting, insatiably curious little person with distinctive traits and interests. So, what is happening in the brain during this metamorphosis? How do humans acquire the motor, linguistic, and social skills that define this vital childhood period? Lise Eliot offers answers to these intriguing questions.

Mescaline, LSD, and psilocybin mushrooms. There’s been a lot of discussion in the medical world lately about the potential benefits of these and other drugs for certain medical conditions, such as anxiety and depression. As we consider the place of psychedelics in the future, we can draw insight and guidance from the history of how psychedelics have been described, sought after, applied, and prohibited over the centuries. Erika Dyck, professor of history at the University of Saskatchewan, introduces you to the world of hallucinogens.

After Romeo and Juliet, Elizabeth Bennet and Fitzwilliam Darcy might just be the world’s most famous fictional couple. The story of how they fall in love—Pride and Prejudice—has left an indelible imprint on popular culture. Readers, novelists, playwrights, filmmakers, and even zombies can’t leave Pride and Prejudice alone. Which raises the question: Why has this novel, of all Jane Austen’s works, remained the general favorite?