"Some infinities are bigger than other infinities" - Hazel Grace Lancaster, in "The Fault in Our Stars," by John Green

How to Draw a Stick Figure

Cartoonist Liana Finck's drawings hold our hands through life's predicaments, big and small: dating, breakups, what to make for dinner, how to leave a party without being rude, how to think about our relationship with God. In a funny,...

The Sun is green, actually. We'll go into why the blackbody effect means the Sun emits more green visible light than any other color, and why evolution and color perception mean it's ok to see it as yellow, anyway.

According to the fossils we've found, it turns out the T-Rex may look different than what we thought! Join Hank Green for a fascinating dive into the past, and a realistic look at what the King of the Dinosaurs was actually like. Let's...

If you were looking down at the Earth from space, what would you be able to see? Do you think you would be able to see your house? What if you were super far away?

The director of the US Federal Emergency Management Agency on Monday called on the people of Texas and Louisiana to "be involved" as the states struggle with the devastating impact of Tropical Storm Harvey. Speaking at FEMA's...

There are about 450 million diabetics around the world, and while we do already have a reliable way of measuring blood sugar, it requires patients to prick their finger each time they want a reading. Is there a better way?

In this video Paul Andersen describes the new AP Biology Exam. This exam will be given for the first time in May of 2013 and will be different from all previous exams. In this video Paul Andersen describes the scoring and the two parts...

Why are Stars Star-Shaped

In this video Paul Andersen explains how contour lines show areas of equal elevation or equal gravitational potential. Contour lines are used as an analogy for lines of equipotential in electric fields.

A geometry/probability question on the Putnam, a famously hard test, about a random tetrahedron in a sphere. This offers an opportunity not just for a lesson about the problem, but about problem-solving tactics in general.

A geometry/probability question on the Putnam, a famously hard test, about a random tetrahedron in a sphere. This offers an opportunity not just for a lesson about the problem, but about problem-solving tactics in general.

Our friend the Giant Squid inspired a SciShow Kids viewer to write us and ask, 'What is squid ink, and can you write with it?' Jessi has the answers!

"A political cartoon is a barometer of freedom," says Rayma Suprani, who was exiled from her native Venezuela for publishing work critical of the government. "That's why dictators hate cartoonists." In a talk illustrated with highlights...

What do raindrops look like? Exactly how we drew them as kids, right? Wrong! Teardrop-shaped rain is physically impossible. This week I went inside a vertical wind tunnel to bring you the true shape of rain.

In this video Paul Andersen shows conceptual thinking in a mini-lesson on cause, mechanism and effect.

T
ERMS:
Cause - a thing that gives rise t
o an event
Ef
fect - an event
Mechanism - the process und
erlying a...

In a talk that could change how you see things, designer and artist Jiabao Li introduces her conceptual projects that expose the inherent bias of digital media. From a helmet that makes you "allergic" to the color red to a browser...

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...

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