We’re going back to the lab! So far we’ve learned some important lab techniques that organic chemists might use day to day, like chromatography and proton NMR, but there are even more to learn. In this episode of Crash Course Organic...

Scientists have figured out that some birds come with built-in alarm calls in their wings

Over the course of human history thousands of languages have developed from what was once a much smaller number. How did we end up with so many? And how do we keep track of them all? Alex Gendler explains how linguists group languages...

Researchers have been studying a promising option for male birth control, and we've learned a bit more about how regeneration works in hydras!

What makes a great leader? Management theorist Simon Sinek suggests, it’s someone who makes their employees feel secure, who draws staffers into a circle of trust. But creating trust and safety — especially in an uneven economy — means...

How do the groups that you're part of affect you? How do you, in turn, affect those groups? Today we are talking about how people in society come together with a look at social groups. We’ll look at what social groups are, the different...

Today we’re going to talk about measures of central tendency - those are the numbers that tend to hang out in the middle of our data: the mean, the median, and mode. All of these numbers can be called “averages” and they’re the numbers...

In the early 19th century, a young Agaidika teenager named Sacajawea was enlisted by explorers Meriwether Lewis and William Clark to aid her husband Toussaint Charbonneau as a guide to the Western United States. Karen Mensing debunks...

Have you ever worried that running causes more problems than it solves?

By analyzing survivorship curves over the centuries, we can learn what’s changed about how - and when - humans die.

Some athletes swear by pickle juice and bananas, but how do they help? Quick Questions explains!

Oxygen is pretty dang amazing! Some of the most intensely studied functional groups in organic chemistry have oxygen atoms. In this episode of Crash Course Organic Chemistry, we're building on the last episode's discussion of...

The way your brain reacts to stimuli might tell us more about who you're friends with, and swatting at mosquitoes might one day bring us positive results.

In 2013, astronomers reported that they'd found what was, at the time, the biggest thing in the known universe.

Many ideas have come and gone, but Project Daedalus was a uniquely ambitious plan from the 1970s that never quite came to be.

Peaceful protests can help people have their voices heard, but sometimes a protest becomes a more aggressive riot. How does that happen?

Hank discusses some new research that studied what makes us unhappy with ourselves and with other people, focusing on homophobia and consumerism.

In our final episode of Crash Course Psychology, Hank discusses the ideas of Aggression and Altruism. These two things are difficult to understand and explain so sit tight and get ready to run the gauntlet of human emotions....

Submillimeter galaxies are ancient, dense, massive galaxies with up to 10 times the number of stars in the Milky Way, and for a long time, scientists couldn’t even figure out how they existed in the first place.

Today we are taking all the things we have learned this year about doing philosophy and applying that to moral considerations regarding non-human animals. We’ll explore what philosophers like Peter Singer and Carl Cohen have to say about...

In this video Paul Andersen explains the importance of social interactions and group behavior. Organisms live in groups because it overs them greater success and has been selected for through natural selection. Some groups are stable...

We place a lot of value on productivity, and being distracted can lower your performance on specific tasks. But it turns out that getting distracted once in a while can actually be a good thing!

In which John Green and Hank Green teach you about how human primates moved out of Africa and turned Earth into a real-life Planet of the Apes. And the apes are people! John and Hank teach you about how humans evolved, and the sort of...

Why is it so hard to speak up and productively disagree at work? Leadership and organization coach Betsy Kauffman shows how to bring the candid conversations that usually happen at the watercooler out into the open with four practical...