From A positive to O negative, everyone's born with a blood type, and they're stuck with that blood type for their whole lives... or are they?

A lot of our videos include the disclaimer "Mice aren't people." But why do we keep saying this, and if rodent studies aren't effective, why do we keep using them?

In the animal kingdom, sleeping can be dangerous. Lying completely motionless and unconscious for hours at a time is just asking for trouble. There are, however, some sleepy risk-takers who spend almost all of their days snoozing.

There are some diseases, like Zika or malaria, that get a lot of media coverage. However, every year, millions of people are infected with diseases that are just as deadly that we never hear anything about.

Hank tells us some of the surprising things that could be causing or contributing to the obesity epidemic.

Humans are great at creating, and solving, problems. Hank talks with Gina McCarthy about the biggest public health problem we face today: climate change. Gina McCarthy is the Director of C-CHANGE (Center for Climate, Health and the...

Bones, you probably have them and they're for more than holding your body upright.

Hank delves into the scientific reasons behind why we are attracted to the people we're attracted to. It's complicated.

If you lost your arm almost immediately after being vaccinated, would you still be vaccinated?

Almost everyone has a scar that tells a story, but have you ever wondered why exactly scars form in the first place?

We all know turtles live an amazingly long time, but what's their secret? And can we apply it to humans?

What killed George Washington? Turns out it was probably related to the bloodletting and other 18th-century medicine his doctors applied.

For those with a fear of needles, edible vaccines seem like some distant utopian dream, but that dream may soon be a reality... for chickens.

Researchers believe you can get reinfected with COVID-19, but we're not quite sure if that's a bad thing yet.

You may have heard the oddly specific advice that pregnant people shouldn't eat soft cheeses, but there's a very good reason for that, and it applies to more than just dairy products.

Hank gives us the top 5 scientifically documented reasons why breastfeeding is awesome - for both mom and baby.

While it’s probably most famous for its role in gene editing, CRISPR does more than just that: its ability to precisely cut and alter DNA could lead to new antibiotics, faster diagnosis tools, and more.

Genetic tests can give you advice about what lifestyle, diet, and level of exercise are best for you. But you should take those suggestions with a grain of salt, because, when it comes to our bodies, our genes aren’t so much an open...

There's a lot we don't understand about autism spectrum disorder, but this week scientists announced that they may have found a link between the disorder and elevated hormone levels.

Keto was all the rage... until it wasn't. If you haven't heard of keto, welcome to the diet that promotes the consumption of ground beef, olive oil and lots of cheese... sounds like a dream, right? Maybe not. Join Michael Aranda for a...

You might have heard that one year in a dog’s life is equivalent to seven in a human’s. But it turns out that the real ratio is both higher AND lower—depending on your dog’s current age.

Learn about the history of dudes, and a new theory about deep voices in this new episode of SciShow News. You know, science... bro... stuff. Hosted by: Hank Green

While you might hear the name John Snow and think of dragons and unfruitful endings. There was a real life physician whose efforts saved lives and built the foundation for modern epidemiology.

Need a determination boost to complete those New Year's Resolutions (or really any kind of resolution)? Look no further than this compilation of SciShow videos from SciShow of yore. Why Our Brains Love Junk Food - 1:11 3 Terrible...