Once upon a time, we coexisted with other human species. And there’s one place on Earth that may have taught us more about that than any other single site.

Associate Producer Stefan Chin faces off against his boss, Hank Green. Will Stefan manage to keep his job? What does a dinosaur sound like? And where is that space whale?

Long before there were strip malls, skyscrapers, and combination Pizza Hut/Taco Bells, nature had its own architects: all kinds of creatures create all kinds of structures for living, raising offspring, or maybe just the occasional...

Tiny creatures called rotifers seem to have no problem continuing their lives after waking from a refreshing 24,000-year nap. And DNA samples from goats that lived 30,000 years ago tell us a bit about how humans were managing them back...

Humans love illusions, but are we the only animals that fall for them?

Humans are fascinated by shiny stuff. Not only do we find these things attractive, but we also tend to perceive them as being high quality. Well, turns out this infatuation may be related to our evolutionary relationship to water.

Today, in our series finale, we're going to talk about the great white whale of navigating online information: your social media feed. Social media shapes both our online and offline behaviors from how we engage in communities and...

In part 2 of our special series on human ancestry, we ask why we are the only surviving branch on the human evolutionary tree. Just 50,000-100,000 years ago, Earth was home to three or four separate human species, including our most...

In which John Green teaches you about war! Specifically, John talks about whether humanity is naturally warlike, hard-wired to kill, or if perhaps war is a cultural construct. John will talk about the Hobbes versus Rousseau debate, the...

A trip into space produces physiological effects in human beings, but it can also change a person in a profound, psychological way.

Hank delves into the scientific reasons behind why we are attracted to the people we're attracted to. It's complicated.

It sure seems like some plants really don't want you hiking through their woods, but maybe your immune system is just overreacting.

Unfortunately, we don’t know how to cure hangovers yet. However, we DO know a lot more about how to make sure you wake up with a hangover. Avoiding some of these behaviors could help you feel better the morning after.

Animals have evolved a variety of ways to survive—including outright theft.

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Evolution is a long, slow process - but sometimes, changes (often caused by humans) happen too quickly for a species to properly adjust. These scenarios are called evolutionary traps, and can lead species to make...

Humanity has changed a lot since the days of our ancestral species, and we have continued evolution to look forward to as well.

Cognitive researcher Nancy Etcoff looks at happiness -- the ways we try to achieve and increase it, the way it's untethered to our real circumstances, and its surprising effect on our bodies.

Paul Andersen reflects on Digital Aristotle, his trip to the YouTube Edu summit, and the future of education

Is a universal translator possible in real life? We already have many programs that claim to be able to take a word, sentence, or entire book in one language and translate it into almost any other. The reality, however, is a bit more...

Theoretical physicist David Deutsch delivers a mind-bending meditation on the "great monotony" -- the idea that nothing novel has appeared in the universe for billions of years -- and shows how humanity's capacity to create explanatory...

They're probably the most successful birds in the history of birds. But what do you really know about pigeons? Hank shares three weird facts about the birds, from their amazing chick-raising trick to their history of heroism in wartime.

You may have seen posts online warning you about the dangers of eating burnt toast, but how much will that actually affect your health?

Many people assume that fish are less intelligent than mammals, but it turns out that isn’t true at all - they are actually way smarter than you probably give them credit for.

We can't know if or how animals understand death, but behavioral changes in some species could mean they experience something similar to human grief.