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.

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.

At the end of his career, Albert Einstein was pursuing a dream far more ambitious than the theory of relativity. He was trying to find an equation that explained all physical reality - a theory of everything. Experimental physicist and award-winning educator Dr. Don Lincoln takes you on this exciting journey in The Theory of Everything: The Quest to Explain All Reality. Suitable for the intellectually curious at all levels and assuming no background beyond basic high-school math, these 24 half-hour lectures cover recent developments at the forefront of particle physics and cosmology.

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.

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.

For the past few hundred years, most of what we’ve been taught about the native cultures of North America came from reports authored by the conquerors and colonizers who destroyed them. Now - with the technological advances of modern archaeology and a new perspective on world history - we are finally able to piece together their compelling true stories. In Ancient Civilizations of North America, Professor Edwin Barnhart, Director of the Maya Exploration Center, will open your eyes to a fascinating world you never knew existed - even though you’ve been living right next to it, or even on top of it.

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.

Bring meaning and joy to all your days with this internationally best-selling guide to the Japanese concept of ikigai - the happiness of always being busy - as revealed by the daily habits of the world's longest-living people.

In The Dorito Effect, Mark Schatzker shows us how our approach to the nation's number-one public health crisis has gotten it wrong. The epidemics of obesity, heart disease, and diabetes are not tied to the overabundance of fat or carbs. Instead we have been led astray by the growing divide between flavor - the tastes we crave - and the underlying nutrition.

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.

Memory is the greatest challenge to learning a foreign language; there are just too many words and too many rules. For every new word we learn, we seem to forget two old ones, making fluency seem out of reach. Fluent Forever tackles this challenge head-on. Starting with pronunciation, you'll learn how to rewire your ears and turn foreign sounds into familiar sounds.

In late 2017, scientists at a Hawaiian observatory glimpsed an object soaring through our inner solar system, moving so quickly that it could only have come from another star. Avi Loeb, Harvard’s top astronomer, showed it was not an asteroid; it was moving too fast along a strange orbit, and left no trail of gas or debris in its wake. There was only one conceivable explanation: the object was a piece of advanced technology created by a distant alien civilization. 

Polly, Annie, Elizabeth, Catherine, and Mary-Jane are famous for the same thing, though they never met. What they had in common was the year of their murders: 1888. The person responsible was never identified, but the character created by the press to fill that gap has become far more famous than any of these five women. For more than a century, newspapers have been keen to tell us that "the Ripper" preyed on prostitutes. Not only is this untrue, as historian Hallie Rubenhold has discovered, but it has prevented the real stories of these fascinating women from being told.

Over the span of 48 lectures, four experienced lawyers and teachers recreate key parts of the first-year law student experience, introducing you to main areas of law most every beginning student studies. Enriched with famous cases from the annals of American law and powerful arguments by some of history's most successful lawyers, these lectures offer access to an often intimidating, surprisingly accessible, and civically important field.

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.