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.

No skill is more important in today's world than being able to think about, understand, and act on information in an effective and responsible way. What's more, at no point in human history have we had access to so much information, with such relative ease, as we do in the 21st century. But because misinformation out there has increased as well, critical thinking is more important than ever. These 24 rewarding lectures equip you with the knowledge and techniques you need to become a savvier, sharper critical thinker in your professional and personal life.

Feeling stressed? You're not alone. Stress is an inherent aspect of life that can have tremendous negative effects on your mental and physical health. This makes coping with stress a critical part of how well we live.Once you understand the inner workings of your stress response system, you'll possess powerful knowledge that will help you understand and better deal with this common aspect of your busy life.

The Peloponnesian War pitted Athens and its allies against a league of city-states headed by Sparta. The ancient Greek historian Thucydides captured this drama with matchless insight in his classic eyewitness account of what was arguably the greatest war in the history of the world up to that time. These 36 half-hour lectures draw on Thucydides' classic account as well as other ancient sources to give you a full picture of the Greek world in uneasy peace and then all-out war in the late 5th century B.C.

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.

Updated with new and revised material to reflect the current market, this new edition of Stock Investing for Dummies gives you proven strategies for selecting and managing profitable investments, no matter what the conditions. You'll find out how to navigate the new economic landscape and choose the right stock for different situations - with real-world examples that show you how to maximize your portfolio.

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. 

In our unique genomes, every one of us carries the story of our species - births, deaths, disease, war, famine, migration, and a lot of sex. But those stories have always been locked away - until now. Who are our ancestors? Where did they come from? Geneticists have suddenly become historians, and the hard evidence in our DNA has completely upended what we thought we knew about ourselves. Acclaimed science writer Adam Rutherford explains exactly how genomics is completely rewriting the human story - from 100,000 years ago to the present.

Every day of your life is spent surrounded by mysteries that involve what appear to be rather ordinary human behaviors. What makes you happy? Where did your personality come from? Why do you have trouble controlling certain behaviors? Why do you behave differently as an adult than you did as an adolescent?Since the start of recorded history, and probably even before, people have been interested in answering questions about why we behave the way we do.

"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.

Most people think the way to write a best seller is to have a lot of talent and even more luck. As you will learn, there is a recipe for success, and luck may be the least important ingredient in creating a best seller. No one has cracked the code better than James Scott Bell. A best-selling author himself, and the author of the number-one best seller for writers, Plot & Structure, Mr. Bell has been teaching the principles of best-selling fiction for over 20 years, principles that apply to any genre or style.

Ordered to hold an abandoned army post, John Dunbar found himself alone, beyond the edge of civilization. Thievery and survival soon forced him into the Indian camp, where he began a dangerous adventure that changed his life forever. Set in 1863, the novel follows Lieutenant John Dunbar on a magical journey from the ravages of the Civil War to the far reaches of the imperiled American frontier, a frontier he naively wants to see "before it is gone".

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.

NASA's history is a familiar story, culminating with the agency successfully landing men on the moon in 1969. But NASA's prehistory is a rarely told tale, one that is largely absent from the popular space-age literature but that gives the context behind the incredible lunar program. America's space agency wasn't created in a vacuum; it was assembled from preexisting parts, drawing together some of the best minds the non-Soviet world had to offer.

Carl Sagan, writer and scientist, returns from the frontier to tell us about how the world works. In his delightfully down-to-earth style, he explores and explains a mind-boggling future of intelligent robots, extraterrestrial life and its consequences, and other provocative, fascinating quandaries of the future that we want to see today.