You might know that chickenpox and shingles are both caused by the same virus, varicella zoster. Here's why the symptoms, and even the vaccines, are different the second time around.

HPV isn't the only virus that causes cancer, but it's one of the best at it. Here's what we've learned about this supervillain of a pathogen, and how to stop it.

From diabetes to Alzheimer's, there's a lot that we hope to be able to treat using stem cell therapies. But the stem cells we use tend to be hard to come by. But it turns out there's a new source of stem cells that has researchers...

Most of us can only see certain wavelengths of light our entire lives. So why can salmon switch on night vision? We'll learn how they can reshape their eyes to see into the infrared.

Sponges might not look like particularly complex animals, but they've had billions of years to evolve their own special systems. And one of those systems might involve sending messages through their body in the form of light.

What do a platypus, a pufferfish, and a seahorse have in common? Why, they all managed to evolve themselves out of having a working stomach! The reasons why might vary, as well as how they manage to live their lives without them, but...

Sometimes called "W-sitting," this popular way for kids to plop in front of the TV has been stigmatized for decades. For most people, research indicates it's just fine. But a small percentage of W-sitters do have a problem.

Long-necked sauropod dinosaurs are some of the most striking animals that ever lived. But we don't know what they used their long necks for, and whether they held them high in the air or parallel to the ground. Here's what we do know.

Chances are, the worst thing that's happened to you because of a sneeze is a snot rocket. But for these people, sneezing caused anything from damaged ears to a broken neck! But in one case, a sneezing fit saved one woman from needing...

Sometimes, major injury causes blood loss that results in improper clotting, or coagulopathy. Some researchers think a compound used in perfume to create jasmine fragrances could help save these patients.

If you're bitten by a snake, you might need a horse to save your life. Researchers are searching for better antivenoms to treat illnesses like snake bite, and they're turning to monoclonal antibodies, made in a lab, to replace the...

For us terrestrial animals, sneezing is a regular part of life involving the movement of a lot of air. But animals that live underwater and don't breathe air like we do also sneeze. Sea sponges, corals, and hagfish use their snot to...

You may have heard of "abortion pills" - here's what these medications are and what they do (and don't do).

Energy use can be confusing – I mean, how do you compare gasoline in your car to electricity piped to your house? That's why we made these things spud-tacularly simple.

When the brain receives pain from an internal organ, it often projects the pain in the wrong place because of the way sensory nerve paths converge

A simple mis-folding in a certain brain protein causes a disease for which we have no cure.

We actually have no idea what a “disease” is.

Quick Questions explains why, when it comes right down to it, there are really only eight kinds of people in the world.

Hank goes over some of the more interesting ways that doctors can use to tell what might be wrong with you.

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.

Does bee venom therapy work? Stings cause pain, itching, or even death in some people, so how might potential benefits outweigh the risks?

Scientists have been trying to pull blood out of the body and put it back in again since the early 1800s, but bypass machines haven't been easy to get right.

Carbs are pinned to be the villains in many diets, but those poor guys are just misunderstood.

Slime videos have been a popular trend on YouTube recently, but there are a few animals with their own versions of slime, which they use for some very cool things!