You’re probably aware that your blood can be A, B, AB or O, but it turns out that blood types can get a lot more complicated than that! *We made a mistake in the credits of this video: The writer of this episode was Alane Lim.

While antibiotics have saved millions of lives, misusing them can speed up how fast bacteria evolve to resist them. And it turns out that one of the biggest hotspots for these antibiotic-resistant bacteria…is hospitals.

In your brain the right side controls the left half of your body and vice versa. We still aren't sure why this is, but some scientists have come up with a pretty bizarre explanation: that some ancient vertebrate ancestor was born with...

It doesn't seem possible, but animal rain is definitely real, and there is an actual scientific explanation for it... probably.

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

You might have heard that exposure to unnatural lights from digital devices can hurt your eyes. But is that true? Hosted by: Stefan Chin

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.

6 Surprising Blood-Drinking Animals

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...

After watching Game of Thrones or playing DND, you might wonder if Dire Wolves were actually real. Turns out, these were real animals that lived during the last Ice Age, but they weren't actually...wolves? Join Hank Green and learn what...

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.

Set against the backdrop of the COVID-19 pandemic, the rise of vaping-related lung injury over the past few years has complicated things since it can cause an uncannily similar host of symptoms to COVID-19. So, let’s take a closer look...

Hank and PhD Candidate Joanna Kreitinger discuss research being performed on dendritic cells in relation to the immune system. Later, Jessi from Animal Wonders joins to show us the emperor scorpions.

We generally think of pregnancy as a continuous process, but scientists have recently discovered mechanisms that allow for certain mammals to put the development of a fetus on pause.

Of all the weird animals that exist in the world, platypuses are up there with the weirdest, and last year scientists discovered something even more peculiar about their fur: it glows! What may be even more strange, though, is how little...

Unless you saw the spider bite you, that swollen, bite-looking lesion on your arm is probably something else, and blaming it on an innocent 8-legged critter might do more harm than good. Hosted by: Stefan Chin

The temperature drops and you're more likely to get a cold: Is this correlation or causation?

According to the fossil record, ancient humans usually had straight teeth, complete with wisdom teeth. In fact, the dental dilemmas that fuel the demand for braces and wisdom teeth extractions today appear to be recent developments. So,...

We know diversity, equity and inclusion (DEI) boosts creativity and profits, but progress has been slow: today, nearly 90 percent of Fortune 500 CEOs are white males. It's time for leaders to become "rock stars" of inclusion -- and that...

An athlete is preparing for a game. They've put on their gear and done their warmup, and now it's time for one more routine — stretching. Typically, athletes stretch before physical activity to avoid injuries like strains and tears. But...

When you think about an eating disorder, you might imagine restricting or purging food. But the most common eating disorder has nothing to do with either of those, and chances are you’ve never heard of it.

A throbbing, pounding headache. Bright zigzagging lines across your field of vision. Sensitivity to light, lingering fatigue, disrupted sleep. While an incapacitating headache is one of the most common symptoms, a migraine can include...

If you read "Bob, a DJ and a clown" on a guest list, are three people coming to the party, or only one? That depends on whether you're for or against the Oxford comma -- perhaps the most hotly contested punctuation mark of all time. When...

A new drug reduces the risk of heart attacks by 40%. Shark attacks are up by a factor of two. Drinking a liter of soda per day doubles your chance of developing cancer. These are all examples of a common way risk is presented in news...