We’ve created simulations to recreate the difference in time it takes for the Sun’s equator and poles to complete rotations, and the way we’ve solved is a bit surprising. And it looks like the Milky Way may not be great at mixing metals,...

This video is about how the physics and chemistry of sugar (in particular, how it melts, and how it caramelizes) is more complicated than you might think. It involves fructose, sucrose, glucose, and a sticky...

Hank describes mitosis and cytokinesis - the series of processes our cells go through to divide into two identical copies.

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.

Quick Questions explains how some bees can transform flower nectar into the liquid gold that you use to sweeten your tea.

Designer Suzanne Lee shares her experiments in growing a kombucha-based material that can be used like fabric or vegetable leather to make clothing. The process is fascinating, the results are beautiful (though there's still one minor...

Fire: it's beautiful, it's dangerous, and it shows up in surprising places. Here are five weird things you might have on hand that can go up in flames.

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UPDATE: We got a couple of things wrong when it comes to gravity (particularly that it has nothing to do with photons). Science is working tirelessly night and day to disprove its own theories about how the universe works (or at least,...

Musty, with hints of vanilla, coffee, and maybe fresh cut grass-- why do old books smell the best?

It's hard to escape childhood without racking up a few scars. Why do these leftover reminders of a painful cut or crash look different from the rest of our skin? And why do they stick around for so long after the incident that caused...

What we know today about global greenhouse gas emissions is mostly self-reported by countries, and those numbers (sometimes tallied manually on paper!) are often inaccurate and prone to manipulation. If we really want to get serious...

Our universe is prone to increasing disorder and chaos. So how did it generate the extreme complexity we see in life? Actually, the laws of physics themselves may demand it.

Today we are talking about 3 scientists who, through their collective inventions and discoveries, have saved millions of lives.

How do we search for alien life if it's nothing like the life that we know? Christoph Adami shows how he uses his research into artificial life -- self-replicating computer programs -- to find a signature, a "biomarker," that is free of...

So, how do engineers even figure out what problem needs to get fixed? And what's the difference between identifying a problem and just complaining about something. In this episode of Crash Course Kids, Sabrina talks about how we can all...

During long, cold winters in medieval Europe, church organs grew gray, sickly-looking circles that spread over their pipes. People back then believed that this was the work of the devil, but as it turns out, it’s just some pretty simple...

Hank talks about space shuttle Discovery's retirement, a private space "taxi cab" service, a breakthrough with man-made DNA, and the similarities between religion and pornography in your brain.

A visual for derivatives which generalizes more nicely to topics beyond calculus.

Paul Andersen details the processes of photosynthesis and respiration in this video on free energy capture and storage. Autotrophs use the light reactions and the Calvin cycle to convert energy from the Sun into sugars. Autotrophs and...

Rice production needs to see a 50% increase by 2030 to keep up with population growth, but as the climate warms, rice plants will likely become less efficient. Fortunately, scientists are working on a pretty clever potential solution.

Hank takes us through the bowels of the human digestive system and explains why it's all about surface area.

What the astronauts felt when they saw earth from space changed them forever. Author and artist Benjamin Grant aims to provoke this same feeling of overwhelming scale and beauty in each of us through a series of stunning satellite images...

Carbon dating is a lot more than just getting the age of a dinosaur bone. We can learn a lot about the world through its use, and it turns out, we have.

In an invitation to slow down and look at the world around you, graphic journalist Wendy MacNaughton illustrates how drawing can spark deeply human, authentic connections. Ready to try? Grab a pencil and join MacNaughton for this...