One of the greatest scientific feats of our era is the astonishing progress made in understanding biology-the intricate machinery of life-a progress to which the period we are living in right now has contributed the most.As you read these words, researchers are delving ever deeper into the workings of living systems, turning their discoveries into new medical treatments, improved methods of growing food, and innovative products that are already changing the world.

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.

 How the Earth Works takes you on an astonishing journey through time and space. In 48 lectures, you will look at what went into making our planet - from the big bang, to the formation of the solar system, to the subsequent evolution of Earth.  

Look beyond the abstract dates and figures, kings and queens, and battles and wars that make up so many historical accounts. Over the course of 48 richly detailed lectures, Professor Garland covers the breadth and depth of human history from the perspective of the so-called ordinary people, from its earliest beginnings through the Middle Ages.

Professor John McWhorter of Columbia University takes you back through time and around the world, following the linguistic trails left by generations of humans that lead back to the beginnings of language. Utilizing historical theories and cutting-edge research, these 34 astonishing lectures will introduce you to the major language families of the world and their many offspring, including a variety of languages that are no longer spoken but provide vital links between past and present. 

The Knights Templar were the wealthiest, most powerful - and most secretive - of the military orders that flourished in the crusading era. Their story - encompassing as it does the greatest international conflict of the Middle Ages, a network of international finance, a swift rise in wealth and influence followed by a bloody and humiliating fall - has left a comet's tail of mystery that continues to fascinate and inspire historians, novelists and conspiracy theorists. Unabridged edition read by Dan Jones.

Gravity controls everything from the falling of an apple to the rising of ocean’s tides to the motions of the heavens above. If you’ve ever wondered how this most puzzling force works across our entire universe, you will be delighted by this 24-part course that is accessible to any curious person, regardless of your science education. No other product on the market presents the subject of gravity in as much detail as this course, which will follow the past 400 years of research and experimentation in the field.

Building a Better Vocabulary offers an intriguing look at the nuts and bolts of English, teaches you the etymology and morphology - or the history and structure - of words, and delves into the cognitive science behind committing new words to long-term memory. By the end of the 36 enjoyable lectures, you will have a practical framework for continuing to build your vocabulary by discovering new words and fully mastering the nuances of familiar ones.

From asking a waiter for an unusual substitution to urging a service manager to get your car finished sooner to swaying your significant other toward a particular film or show, many of the decisions you make are decided by talking. And no matter why you engage in face-to-face talk, there's no way to insulate yourself from the dangers of miscommunication. These 24 mind-opening lectures are your chance to learn more about how you communicate verbally, the common problems you can encounter in doing so, and how you can improve your own effectiveness.

Nothing has had a more profound impact on the development of modern civilization than thermodynamics. Thermodynamic processes are at the heart of everything that involves heat, energy, and work, making an understanding of the subject indispensable for careers in engineering, physical science, biology, meteorology, and even nutrition and culinary arts. Get an in-depth tour of this vital and fascinating science in 24 enthralling lectures suitable for everyone from science novices to experts who wish to review elementary concepts and formulas.

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.

The Tao of Seneca (volumes 1-3) is an introduction to Stoic philosophy through the words of Seneca. If you study Seneca, you'll be in good company. He was popular with the educated elite of the Greco-Roman Empire, but Thomas Jefferson also had Seneca on his bedside table. Thought leaders in Silicon Valley tout the benefits of Stoicism, and NFL management, coaches, and players alike - from teams such as the Patriots and Seahawks - have embraced it.

Touched off by a terrorist act in Bosnia and spreading all too quickly beyond the expectations of those who were involved, World War I was an unprecedented catastrophe with a ghastly cost. After this first "total war"-the first conflict involving entire societies mobilized to wage unrestrained war, devoting all their wealth, industries, institutions, and the lives of their citizens to win victory at any price - the world itself would never be the same.

The Crusades is an authoritative, accessible single-volume history of the brutal struggle for the Holy Land in the Middle Ages. Thomas Asbridge - a renowned historian who writes with "maximum vividness" (Joan Acocella, The New Yorker) - covers the years 1095 to 1291 in this big, ambitious, listenable account of one of the most fascinating periods in history.

"It doesn't take an Einstein to understand modern physics," says Professor Wolfson at the outset of these 24 lectures on what may be the most important subjects in the universe: relativity and quantum physics. Both have reputations for complexity. But the basic ideas behind them are, in fact, simple and comprehensible by anyone. These dynamic and illuminating lectures begin with a brief overview of theories of physical reality starting with Aristotle and culminating in Newtonian or "classical" physics.