In a globe-trotting career that has spanned corporations, governments, nonprofits and philanthropy, Rosita Najmi has often found herself translating among them. Instead of focusing on leadership style, she makes the case for becoming...

Megafires, or fires that burn more than 100,000 acres, are becoming more frequent worldwide, wreaking havoc on landscapes and communities -- and fire experts say the problem is only going to get worse. George T. Whitesides is focused on...

The fabled Mirzakhani wand is the most powerful magical item ever created. And that's why the evil wizard Moldevort is planning to use it to conquer the world. You and Drumbledrore have finally discovered its hiding place in a cave, but...

After a week of studying, you feel confident that you'll ace your exam. But when you get your grade back, it's much lower than you expected. You're devastated, and the disappointment is hard to shake. Should you be trying to look on the...

When you report an emergency in the US, police, firefighters or paramedics answer the call. What if mental health professionals responded, too? Colorado State Representative Leslie Herod shares a straightforward and research-backed...

We have the right to demand budgets to be equitable, to be fair, says economist Maja Bosnic. One way to get there is to make them gender-responsive. With examples from the nearly 80 countries around the world already factoring gender...

From outbreaks of measles in the United States and cholera in Haiti to patterns of lead poisoning near gold mines in Nigeria, medical geographers play an important role in tracking disease in the landscape. Today, we're going to look at...

How do con artists manage to scam millions? Why do people choose to follow great leaders, or horrible ones? How do CEOs get better deals in the boardroom? Influence. In this episode of Crash Course Business, Evelyn chats to us about what...

In 2020, Mali produced over 71 tons of gold— an amount worth billions of dollars. But Mali saw only $850 million dollars from that gold. And this situation isn't unique: a number of other gold-rich countries in Africa aren't seeing the...

In which you are introduced to the life and accomplishments of Alexander the Great, his empire, his horse Bucephalus, the empires that came after him, and the idea of Greatness. Is greatness a question of accomplishment, of impact, or...

Difficult emotions can get under your skin if you're not careful. Sport and performance consultant Jessica Woods calls this the "jumping cholla effect," inspired by a sneaky kind of cactus that detaches and burrows its spines into...

Imagine a police lineup where ten witnesses are asked to identify a bank robber they glimpsed fleeing the scene. If six of them pick the same person, there's a good chance that's the culprit. And if all ten do, you might think the case...

* Viewer discretion advised. This video includes discussion of mature topics and may be inappropriate for some audiences. In this quick talk, visual artist Dread Scott tells the story of one of his most transgressive art installations,...

A new strain of the E. coli bacteria seems to have become resistant to most antibiotics. Let’s talk about how this possibly happened.

In this moving yet pragmatic talk, Kevin Bales explains the business of modern slavery, a multibillion-dollar economy that underpins some of the worst industries on earth. He shares stats and personal stories from his on-the-ground...

Scientists have warned that as CO2 levels in the atmosphere rise an increase in Earth's temperature by even two degrees could lead to catastrophic effects across the world. But how can such a tiny, measurable change in one factor lead to...

Even if you're Mel Gibson or Kanye, it's probably best to not wear all of your emotions on your sleeve. In this episode of Crash Course Psychology, Hank talks about these things called "Emotions". What are they? And why do we...

At the US-Mexico border, policies of prolonged detention and family separation have made seeking asylum in the United States difficult and dangerous. In this raw and heartfelt talk, immigration attorney Erika Pinheiro offers a glimpse...

In this powerful talk from TEDGlobal, Rebecca MacKinnon describes the expanding struggle for freedom and control in cyberspace, and asks: How do we design the next phase of the Internet with accountability and freedom at its core, rather...

This week, a group of scientists estimated the cost of saving just one small village in America’s Chesapeake Bay from rising sea levels, and another found evidence that Smilodon (aka the saber-toothed cat) actually helped take care of...

* Viewer discretion advised. This video includes discussion of mature topics and may be inappropriate for some audiences.

This talk begins with a personal story of sexual violence that may be difficult to listen to. But that's the...

Why do people do bad things? Is it because of the situation or who they are at their core? In this week's episode of Crash Course Psychology, Hank works to shed a little light on the ideas of Situation vs. Personality. Oh, and...

Jeremy Smith and Sherri Davidoff talk hacking, cyber security, and the end of the world, and Jessi stops by with Rook the Raven.

Imagine you're a shipwrecked sailor adrift in the enormous Pacific. You can choose one of three directions and save yourself and your shipmates -- but each choice comes with a fearful consequence too. How do you choose? In telling the...