Geologists have a few ideas as to how rain affects mountains. But could rain also help mountains grow?

Problem 2 from the 2011 IMO

What can we learn from people with the genetics to get sick — who don't? With most inherited diseases, only some family members will develop the disease, while others who carry the same genetic risks dodge it. Stephen Friend suggests we...

Join Jessi and Squeaks as they answer questions in the first viewer mail episode from SciShow Kids!

Investigative journalist Will Potter is the only reporter who has been inside a Communications Management unit, or CMu, within a uS prison. These units were opened secretly, and radically alter how prisoners are treated -- even...

Sustainability is pretty clearly one of the world's most important goals; but what groups can really make environmental progress in leaps and bounds? Chris McKnett makes the case that it's large institutional investors. He shows how...

Why are babies cute? Why is cake sweet? Philosopher Dan Dennett has answers you wouldn't expect, as he shares evolution's counterintuitive reasoning on cute, sweet and sexy things (plus a new theory from Matthew Hurley on why jokes are...

What happens if you eat too many raw eggs? What are those little rods sticking out of airplane wings? All this, and more as Nicole Sweeney, host of Crash Course Sociology, faces off against Hank in an episode of the SciShow Quiz Show.

Problem 2 from the 2011 IMO

Physics doesn't just happen in a fancy lab -- it happens when you push a piece of buttered toast off the table or drop a couple of raisins in a fizzy drink or watch a coffee spill dry. Become a more interesting dinner guest as physicist...

Selecting which solution is the best solution to a problem may seem difficult at first. But if you are patient and think about what you need an effective solution to be, you can do it. In this episode of Crash Course Kids, Sabrina shows...

It's been a long road to the discovery that Earth is not the center of the Solar System, the Milky Way, or the universe; great thinkers from Aristotle to Bruno have grappled with it for millennia. But if we aren't at the center of the...

How did the US immigration debate get to be so divisive? In this informative talk, historian and writer Paul A. Kramer shows how an "insider vs. outsider" framing has come to dominate the way people in the US talk about immigration --...

There are a few reasons that modern humans have to brush our teeth to stay healthy, even though our primate cousins don’t. Grab your floss and find the answers inside!

The Drake Equation tells us the likelihood that there are other advanced technological civilizations waiting for us among the stars. In this episode of Space Time we challenge you to use the Drake Equation to help us determine how near...

SciShow Space shares the latest news from around the universe, including new insights into the giant supercluster of galaxies that we call home, and the first "data baby" from Rosetta's rendezvous with a comet.

Some people don’t have or use visual imagination, or the “mind’s eye.” Many with this condition, called aphantasia, might not even realize that they’re experiencing the world differently, but this difference offers a new window into how...

While we like to imagine little green men, it's far more likely that life on other planets will be microbial. Planetary scientist Nathalie Cabrol takes us inside the search for microbes on Mars, a hunt which counterintuitively leads us...

As a sex educator, Emily Nagoski is often asked: How do couples sustain a strong sexual connection over the long term? In this funny, insightful talk, she shares her answer -- drawing on (somewhat surprising) research to reveal why some...

What's the best country to live in? Is it the one with the best food? The longest life expectancy? The best weather? For the past 70 years, most governments have relied heavily on a single number: the Gross Domestic Product, or GDP. But...

* Viewer discretion advised. This video includes discussion of mature topics and may be inappropriate for some audiences. Currency -- the bills and coins you carry in your wallet and in your bank account -- is founded on marketing, on...

Is teleportation possible? Could a baseball transform into something like a radio wave, travel through buildings, bounce around corners, and change back into a baseball? Oddly enough, thanks to quantum mechanics, the answer might...

You might think you need a brain to be able to sleep, but organisms with super simple neural networks can still "sleep" sort of like we do. So, if these organisms can sleep too, then what is sleep anyway?

Hank goes head-to-head with Minute Physics’ Henry Reich to test their wits about the winter solstice, reindeer, and the science of snow! Chapters View all HANK GREEN 0:20 HENRY REICH 0:28 MAX LOUTZENHEISER 1:03 FLORIAN STINGLMAYR 1:06...