The Milky Way’s Black Hole Burped 3.5 Million Years Ago

This episode is sponsored by Squarespace. From websites and online stores to marketing tools and analytics, Squarespace is the all-in-one platform to build a beautiful online presence and run your business. [♪ INTRO] Just like most major galaxies, our Milky Way’s core is home to a supermassive black hole. And just like in most major […]

Motor Proteins: Tiny Pirates in Your Cells

[Intro] If you’ve ever taken an Intro to Biology class, you might have noticed that there are some pretty big but pretty basic things about your own cells that never really get explained. Or at least not explained well. Like, what makes your cells divide when they copy themselves, and how does stuff get carried […]

Why Venus Is THE WORST

Thanks for CuriosityStream for supporting this episode! Go to to learn more. [ intro ] Venus is sometimes referred to as Earth’s sister planet. It’s close by, and pretty similar in size. It’s thought to have been fairly Earth-like early in its history. Once upon a time, it may even have had lots of […]

The History of Life on Earth – Crash Course Ecology #1

In the past 40 wonderful weeks together, we’ve explored all of the fundamentals of biology, from the tiny little machines that make us work to the systems that power the most awe-inspiring and most complex organisms on earth. Now, I want to take our learning to the next level, simply by broadening our perspective. With […]

Move Over, Mars: We Could Farm on Asteroids!

SciShow is supported by Blue Apron. Right now, Blue Apron is offering $50 off two boxes of meals to the first 50 SciShow Space viewers to sign up. Get fresh ingredients and chef-designed recipes delivered right to your door. Just click on the link in the description to get $50 off your first two Blue […]

The 5 Most Important Molecules in Your Body

Your body has all sorts of complicated processes going on inside it and a lot and a lot of these processes are carried on by incredibly powerful and often incredibly large molecules. Some of these molecules that you’re using right now are so big that they challenge the definition of what a molecule is. Technically […]

Attack of the Super Bugs

What potential disasters keep you up at night? Meteor strikes? Super Volcanos? World War Three? World war Z? Those are all pretty scary and we didn’t even mention climate change but there’s one other immediate terrifying, scientific problem that rises above the rest… Superbugs I’m not talking about giant spiders of Mirkwood or tracker jackers. […]

Fungi: Death Becomes Them – CrashCourse Biology #39

Hello and welcome to the wonderful world of fungi (fuhn-gahy), or fungi (fuhn-jahy). Both are acceptable pronunciations. But I say fungi because it’s fungus. Not fun-jus. Though fun-jus is also fun to say. Fungi are a little bit like plants, and more like animals than you might think. They diverged from protists about a billion […]

Digestive System, Part 1: Crash Course A&P #33

We all have our reasons for eating nachos at 3 in the afternoon. I happen to have my own. And don’t ask — it’s personal. But more generally, we all eat any kind of food to accomplish two simple things: to obtain the energy we need to stay alive and to get the raw materials […]

Great Glands – Your Endocrine System: CrashCourse Biology #33

Hormones! Those things that make teenagers moody and miserable, and they cause growth spurts and acne, and they can make a perfectly normal student totally obsessed with his algebra teacher. Not that I have any real, boots-on-the-ground experience with that last one. But all that mayhem is just the handiwork of your sex hormones. The […]