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.

Conventional wisdom suggests English is going to the dogs, that bad grammar, slang, and illogical constructions signal a decline in standards of usage - to say nothing of the corruption wrought by email and text messages. But English is a complicated, marvelous language. Far from being a language in decline, English is the product of surprisingly varied linguistic forces, some of which have only recently come to light. And these forces continue to push English in exciting new directions.

Imagine a world without bees, butterflies, and flowering plants. That was Earth 125 million years ago. Turn back the clock 400 million years, and there were no trees. At 450 million years in the past, even the earliest insects had not yet developed. And looking back 500 million years, the land was devoid of life, which at that time flourished in a profusion of strange forms in the oceans. These and other major turning points are the amazing story of evolution.

Linguistics, the study of language, has a reputation for being complex and inaccessible. But here's a secret: There's a lot that's quirky and intriguing about how human language works-and much of it is downright fun to learn about. But with so many potential avenues of exploration, it can often seem daunting to try to understand it. Where does one even start?

The Science of Information: From Language to Black Holes covers the exciting concepts, history, and applications of information theory in 24 challenging and eye-opening half-hour lectures taught by Professor Benjamin Schumacher of Kenyon College. A prominent physicist and award-winning educator at one of the nation’s top liberal arts colleges, Professor Schumacher is also a pioneer in the field of quantum information, which is the latest exciting development in this dynamic scientific field. 

From new words such as "bling" and "email" to the role of text messaging and other electronic communications, English is changing all around us. Discover the secrets behind the words in our everyday lexicon with this delightful, informative survey of English, from its Germanic origins to the rise of globalization and cyber-communications. Professor Curzan approaches words like an archaeologist, digging below the surface to uncover the story of words, from the humble "she" to such SAT words as "conflagration" and "pedimanous."

Eating is an indispensable human activity. As a result, whether we realize it or not, the drive to obtain food has been a major catalyst across all of history, from prehistoric times to the present. Epicure Jean-Anthelme Brillat-Savarin said it best: "Gastronomy governs the whole life of man."

 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.  

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.

This course offers an overview of the English language that is literary, historical, cultural, political, and scientific in its scope and designed to give you greater insight into the written and spoken word.The lectures provide a thorough understanding of the history of the English language - from its origins as a dialect of the Germanic-speaking peoples through the literary and cultural documents of its 1,500-year span to the state of American speech today.

At just over 5,000 years old, writing is actually a relatively recent invention. It has become so central to the way we communicate and live, however, that it often seems as if writing has always existed. But the question remains: Who invented writing, and why?In these 24 fascinating lectures, you'll trace the remarkable saga of the invention and evolution of "visible speech," from its earliest origins to its future in the digital age.

What is our species' greatest invention? Medicine, computers, space travel? Not even close. The innovation that underlies each of our past achievements and those we still aspire to is language. Language is the ultimate invention of Homo sapiens - one that has allowed us to change the physical and social world around us in every conceivable way, and an invention that has fundamentally changed us, as well.

No Calculator? No Problem! Mastering Mental Math , award-winning professor of mathematics and celebrated “mathemagician” Arthur T. Benjamin delivers 10 fun-filled lessons on how to do math in your head with confidence, accuracy, and speed - sometimes faster than a calculator. By the end of Professor Benjamin’s lessons, you’ll be able to add, subtract, multiply, and divide numbers faster than ever before. And with your newfound skills, you’ll soon find yourself amazing other people and, perhaps more important, yourself.

Many of us know the Black Death as a catastrophic event of the medieval world. But the Black Death was arguably the most significant event in Western history, profoundly affecting every aspect of human life, from the economic and social to the political, religious, and cultural. In its wake the plague left a world that was utterly changed, forever altering the traditional structure of European societies and forcing a rethinking of every single system of Western civilization: food production and trade, the church, political institutions, law, art, and more.

The ancient world has cast a long shadow, influencing our customs and religious beliefs, our laws, and the form of our governments. It has taught us when and how we make war or pursue peace. It has shaped the buildings we live and work in and the art we hang on our walls. It has given us the calendar that organizes our year and has left its mark on the games we play.