We all know ducks quack, dogs bark, and birds chirp, but that barely scratches the surface of all the amazing ways animals have devised to talk to each other!

In the first video in our two part series on HIV and AIDS, we explain how scientists figured out what HIV is, when the infection morphs into AIDS, and where they think the virus originated.

We've all experienced the sunk cost fallacy: when you are deep into a task and tell yourself that you’ve come this far, so you may as well finish it. We do this even if it's no longer logical to finish. So why do we do it?

How do we define worth in society, and who gets status? Sociologist Michele Lamont studies these questions and investigates ways to broaden the circle of recognition and fight the harm of social stigmatization. She lays out the steps...

You’re on the internet, so you probably know that people sometimes claim to have been abducted by aliens. When researchers start to look closely at these stories and where they come from, they begin to realize that there might be...

Some scientists believe that 3.6 billion years ago Earth might have been purple, and that theory is giving us some clues in our search for life in the universe.

Everyone does it, but why? In this episode of SciShow Quick Questions you get the answers!

Chimpanzees in Gabon have been observed using bugs as a possible antiseptic, but what's more surprising is that they're applying this remedy to one another in what may be a form of chimpanzee health care.

Scientists are looking to end how we categorize living fossils, and in doing so, give the phrase new life.

Hank helps us understand the difference between the colloquial meaning of randomness, and the scientific meaning, which is also known as stochasticity. We will learn how, in fact, randomness is surprisingly predictable.

In a 1990's study, participants recalled getting lost in a shopping mall as children. Some shared these memories in vivid detail, but there was one problem: none of these people had actually gotten lost in a mall. They produced these...

Some birds fly in V shapes because it has many benefits, but other birds fly in clumps instead. Why would they do that?

Photographs do more than document history -- they make it. At TED University, Jonathan Klein of Getty Images shows some of the most iconic, and talks about what happens when a generation sees an image so powerful it can't look away -- or...

You know the Golden Ratio, but what is the Silver Ratio?

Today we're going to talk about degrees of freedom - which are the number of independent pieces of information that make up our models. More degrees of freedom typically mean more concrete results. But something that is statistically...

385 million years ago, a group of fish would undertake one of the most important journeys in the history of life and become the first vertebrates to live on dry ground. But first, they had to acquire the ability to breathe air.

Cocaine addiction is difficult to treat, but with the help of gene therapy, scientists are hoping to change that

You might think venomous snakes or fierce lions are the best hunters, but turns out they are not even close to these 6 actual best hunters in the animal kingdom.

With our current understanding of evolutionary history and our strategy of cladistic naming, if we wanted to have both goldfish and sharks under a single group called "fish", then mammals must also be called...

Scientists have developed a way to grow miniature versions of human organs; some of the weirdest organoids are the mini brains.

While not the kind of epidemic you're used to hearing about, nearsightedness is becoming a major health issue in many places. Learn about how scientists are finding out the reasons behind the increase in myopia, and how sunlight might be...

Archaeology might make you think about excavating dinosaur bones or exploring ancient ruins, but we can also learn a lot about the past through experimentation, sometimes with some pretty tasty results!

Hank fixes those of us who are probably wrong about what is and is not a dinosaur... and gives a refresher to those of us who do know this already.

The shape of molecules is super important to life as we know it. In this episode of Crash Course Organic Chemistry we’re learning about stereochemistry and how to identify molecules as chiral or achiral. And as always, we’ll be doing a...