It's a big day for Jessi and Squeaks because they've finally finished their brand new observatory! Join them as they try out their new telescope and take a look back at a compilation of everything we've learned about space so far!

In which Hank blows our minds with the different kinds of Solids out there and talks about why they're all different and have different properties. Today, you'll learn about amorphous and crystalline solids, types of crystalline...

Due to a revolution in our understanding of the tree of life, birds are dinosaurs, while dimetrodons are not.

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FYI: We try to leave jargon out...

You are made of polymers, and so are trees and telephones and toys. A polymer is a long chain of identical molecules (or monomers) with a range of useful properties, like toughness or stretchiness -- and it turns out, we just can't live...

Your head feels too big and things just keep getting curiouser and curiouser. Did you step through the looking glass or is it a super rare neurological condition?

We still don't know a lot about the deep sea, but thanks to the help of three dead alligators, we know more about the diets of some of the creatures that live there.

Hank explains the little we know about the perceptual condition known as synesthesia, where a person involuntary associates one sensation or experience with another sensation.

Your genome, every human's genome, consists of a unique DNA sequence of A's, T's, C's and G's that tell your cells how to operate. Thanks to technological advances, scientists are now able to know the sequence of letters that makes up an...

As the population grows, the demand for food is only going to increase, but luckily, scientists are already working to solve this problem.

Science, while often the result of a stroke of genius, can just as easily be a stroke of extraordinarily good luck. Mendel’s work just happened to be a mix of the two.

If you don't have vision problems, getting an eye exam probably hasn't been your top priority, however visiting an ophthalmologist won't just tell you about your eyes, it can reveal a lot about your health.

Today is the day we finally talk about the normal distribution! The normal distribution is incredibly important in statistics because distributions of means are normally distributed even if populations aren't. We'll get into why this is...

Updated Mitosis Video. The Amoeba Sisters walk you through the reason for mitosis with mnemonics for prophase, metaphase, anaphase, and telophase. Table of Contents: 00:00 Intro 0:44 Why is Mitosis Important? 2:00 Why Don't You Want...

Dyslexia affects up to 1 in 5 people, but the experience of dyslexia isn't always the same. This difficulty in processing language exists along a spectrum -- one that doesn't necessarily fit with labels like "normal" and "defective."...

When you hear the words dire wolf, your mind might jump to Game of Thrones or Dungeons and Dragons, but dire wolves are not just in the realm of fantasy and fiction. They were real animals that lived during the last Ice Age, and we're...

Approximately seven million people around the world die from heart attacks every year. And cardiovascular disease, which causes heart attacks and other problems like strokes, is the world's leading killer. So what causes a heart attack?...

The idea that humans react to disasters by losing control and acting selfishly is all too prevalent, especially in movies and television. But recent studies on altruism may provide evidence that this isn’t always the case, and this...

From turf toe to toxic Zamboni's, sports injuries aren't just for pro athletes.

You might not believe it, but the same chemistry that brought us bulletproof vests and modern sailing sails also gave us the technology to build your smart phone. But that doesn’t mean these chemists were thinking about these...

Some of the biggest evolution questions finally answered.

Emotional abuse can be incredibly damaging, increasing a person's chances of developing depression and anxiety. But these behaviors can be subtle and difficult to spot, both from within and outside a relationship. It also often makes...

Why do humans cook? Holidays are celebrated in many ways, but chances are they involve eating, and eating a LOT. Ever wonder why we cook our food? We do it because it tastes good, of course, and because our customs and traditions are...

Ever call someone OCD because they like to have a clean apartment? Ever tell someone you have a phobia of spiders when, in fact, they just creep you out a little? In this episode of Crash Course psychology, Hank talks about...

The search for our origins go back to a single common ancestor -- one that remains shrouded in mystery. It's the ancestor of everything we know and today scientists call it the last universal common ancestor, or LUCA.