In today's episode Hank talks about hair: What's it good for, what's it made of, and why do we have less than other mammals?

Chimpanzees and bonobos may be very close to us humans on the tree of life, but one of our differences is the way we store fat. That difference comes down to types of fat cells and our DNA. Hosted by: Hank Green

About 10% of the world population is left-handed. But why does handedness exist and what determines which hand is dominant? Scientists have suggested several theories, but the answer may well lie with evolution.

We often think of categories as fixed, with a species being a species no matter what. The thing is, life doesn’t have to follow our rules.

Imagine opening a bag of chips, only to find Santa Claus looking back at you. Or turning a corner to see a building smiling at you. Humans see faces in all kinds of mundane objects, but these faces aren't real— they're illusions due to a...

According to the fossil record, ancient humans usually had straight teeth, complete with wisdom teeth. In fact, the dental dilemmas that fuel the demand for braces and wisdom teeth extractions today appear to be recent developments. So,...

A lot of our food comes from plants, including honey! Mister Brown and Squeaks learn how honey goes from being watery nectar in a flower to the sweet sticky substance we all know and love - and it's all thanks to bees!

Imagine that your life began as one of the planet's first humans. After dying, you're reincarnated as the second human ever to live. You then return as the third person, the fourth, the fifth, and so on – living the lives of every human...

Can AI help us see beyond our human capabilities? Through a kaleidoscopic blend of technology, nature and art, neural artist Sofia Crespo brings to life animals that push the boundaries of creativity and imagination. Her artistic...

People have been captivated by horses for a long time. They appear more than any other animal in cave paintings dating back 30,000 years. But how did horses make the journey from wild animals to ones humans could hitch themselves to and...

Mosquitoes are responsible for more human deaths every year than any other animal, but very few of the 3,500 mosquito species actually transmit deadly diseases to humans. Scientists have been conducting experiments using engineered...

Nestled in the forests of Canada sits the world's longest beaver dam. This 850-meter-long structure is large enough to be seen in satellite imagery and has dramatically transformed the region, creating a pond containing 70 million liters...

In the Serengeti region in Tanzania, conflict can arise between humans and the elephants that graze on their crops. The U.S.-based nonprofit RESOLVE is testing a new way to reduce these clashes while protecting both elephants and humans:...

In a web exclusive interview, Emily Anthes, author of the book, "Frankenstein's Cat," talks to Ray Suarez about the ethical limits when using animals in biotech research and development.

More than three million women are forced into servitude as domestic workers every year, often lured to other countries in the Persian Gulf or Middle East under false pretenses. Special correspondent Fred de Sam Lazaro reports on ways...

In Florida, a toxic algae bloom that began last fall has killed dolphins, sea turtles, manatees, even a whale shark. And the toxins are not only devastating to wildlife, but difficult for humans and the economy as well. William Brangham...

John Green is teaching history again. This time, we're looking at the history of Europe in 50 episodes. We'll start at the tail end of the so called Middle Ages, and look at how Europe's place in the world has developed and changed in...

Welcome to the Neighborhood! Humans need a lot of things to survive (I'm sure you've noticed). We need food, water, and shelter and it takes a lot of resources to get all of those things. What are resources? In this episode of Crash...

Scientists know that the Y chromosome has been shrinking in size over millions of years, but recent studies suggest that it has more important genes, besides the ones that cause biological maleness.

Some of humanity’s favorite antibiotics are starting to lose their mojo, in the face of smart, sneaky, and rapidly-evolving bacteria. To find new drugs to combat these superbugs, scientists are looking in some weird new places, like...

We don't want to deluge you with information on the subject, but this week on Crash Course Mythology, Mike Rugnetta is talking once again about floods. We're looking at ancient flood myths in the Americas, and what they can tell us about...

What will become of humanity after spend a few hundred years on Mars? What will happen after a few thousand? Evolution has, and still is, shaping humanity in rather drastic ways. How long will humans stop being human and become Martian?

Today we're going to talk about robots! Robots are often thought as a technology of the future, but they're already here by the millions in the workplace, our homes, and pretty soon on the roads. We'll discuss the origins of robotics to...

This week on Crash Course mythology, Mike is talking to you about floods. You may have heard the story of Noah and the Ark from the Bible, but that is not the only deluge story humans tell. It's a common thing across culture. You could...