The little fish Danio rerio holds secrets to understanding how vertebrates develop, how diseases like cancer work, and how we might one day learn how to regenerate human heart tissue.

In this fascinating conversation, cosmologist and TED Fellow Katie Mack delves into everything from the Big Bang theory to what we see at the edge of the observable universe to a few ways the cosmos might end. Stay tuned to hear Mack...

The malaria vaccine was invented more than a century ago -- yet each year, hundreds of thousands of people still die from the disease. How can we improve this vital vaccine? In this informative talk, immunologist and TED Fellow Faith...

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.

People ask Google everything under the sun. One of the most commonly searched questions in the world is “How do I grow a beard?”? Let SciShow explain.

China is the world's biggest polluter -- and now one of its largest producers of clean energy. Which way will China go in the future, and how will it affect the global environment? Data scientist Angel Hsu describes how the most populous...

What does your chair say about what you value? Designer Sebastian Deterding shows how our visions of morality and "the good life" are reflected in the design of objects around us.

Every cell in the human body has a sex, which means that men and women are different right down to the cellular level. Yet too often, research and medicine ignore this insight -- and the often startlingly different ways in which the two...

With quick wit and sharp insight, writer Jeanette Winterson lays out a vision of the future where human and machine intelligence meld -- forming what she calls "alternative intelligence" -- and takes a philosophical look at our species,...

Paul Andersen explains the importance of modeling in science and engineering. Models are used by scientists to explain phenomenon. Unlike mental models, conceptual models can be shared by all scientists to improve our understanding of...

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...

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 --...

Is there more than one universe? In this visually rich, action-packed talk, Brian Greene shows how the unanswered questions of physics (starting with a big one: What caused the Big Bang?) have led to the theory that our own universe is...

What is the derivative of a^x? Why is e^x its own derivative? This video shows how to think about the rule for differentiating exponential functions.

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...

Paul Andersen explains how he is using the blended learning cycle in his science classroom. This cycle moves through the following steps; QUestion, Investigation/Inquiry, Video, Elaboration, Review and Summary quiz

SciShow’s Executive producer Hank Green faces off against SciShow senior editor Alyssa Lerner in this Quiz Show about weird experiments and strange animal parts.

In this gripping talk, lawyer Jason McCue urges for a new way to attack terrorism, to weaken its credibility with those who are buying the product -- the recruits. He shares stories of real cases where he and other activists used this...

There's a lot more to Saturn's rings than just looking awesome! Find out why!

You're going to bed, and you take a sip of cool delicious water, and it's so refreshing. But, when you wake up and take a swig, that water now tastes like bleh. What's going on here? Watch this SciShow Quick Question to find out!

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!

Moser's circle problem. What is this pattern: 1, 2, 4, 8, 16, 31,...

If you live in a cold climate, you might know the agony of trying to get your car started on a chilly winter morning, or standing helplessly by as your phone's battery level plummets. So why do cold weather and batteries seem to just not...

A beautiful solution to the Basel Problem (1+1/4+1/9+1/16+...) using Euclidian geometry. Unlike many more common proofs, this one makes it very clear why pi is involved in the answer.