Across life on Earth, blood comes in red, blue, green, purple, even clear. But why? And what makes your blood different from mine? This video will teach you everything you need to know about the strange world of blood—what it does, why...

When you think about the body’s infrastructure, you probably think of bones. But what about the heart, the blood vessels, and the lymphatic system? In this episode of Crash Course Biology, we’ll tour the cardiovascular, lymphatic, and...

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

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?

Dogs do a lot of weird things, and sometimes they’re funny enough to post on Tumblr. But before you do, make sure li’l Scamp isn’t doing any of these three things -- because they spell trouble.

Stem cells are widely believed to hold great promise in medical research because of their ability to transform into all sorts of other cell types, and scientists can grow it in living mice.

Your cells are coated with sugars that store information and speak a secret language. What are they trying to tell us? Your blood type, for one -- and, potentially, that you have cancer. Chemical biologist Carolyn Bertozzi researches how...

What if diseases could be treated with a patient's own cells, precisely and on demand? Biotech entrepreneur Nabiha Saklayen explains how we could harness advances in biology, machine learning and lasers to create personalized stem cell...

Dogs do a lot of weird things, and sometimes they're funny enough to post on Tumblr. But before you do, make sure li'l Scamp isn't doing any of these three things -- because they spell trouble.

An Australian man named James Harrison holds the world record for most blood donations. His blood has saved the lives of millions of newborn babies, but how can one man's blood help babies all over the world?

Inventor Manu Prakash turns everyday materials into powerful scientific devices, from paper microscopes to a clever new mosquito tracker. From the TED Fellows stage, he demos Paperfuge, a hand-powered centrifuge inspired by a spinning...

The pigments in our food all get destroyed on their way through our digestive system...so where do the colours of our poop and pee come from?

It's Green vs. Green in this week's quiz show as Hank battles Katherine to see who takes home all the marriage points.

When camels drink, they do so at a rate that would kill most other animals. But where does all of that water go? Hint: It's not their humps!

Horseshoe crabs aren't really crabs, but they are super old, super cool, and they deserve your respect. Because they may have already saved your life. SciShow explains!

Traditional lab tests for disease diagnosis can be too expensive and cumbersome for the regions most in need. George Whitesides' ingenious answer is a foolproof tool that can be manufactured at virtually zero cost.

How do cells in your body differentiate into other types of cells? Explore cell specialization featuring stem cells and their role in cell differentiation.

Lots of genetic diseases come down to a small change in a single gene, but how do you treat those diseases when the cells involved don’t have any DNA?

We all know that we need things like water and oxygen to live, but what happens when you get too much of a good thing?

One of the most commonly googled questions in the world is why feces can be green. Well, Quick Questions has the answer!

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?

Stem cells found in the bone marrow are crucial for our health because they are needed to become new blood cells that sustain and protect our bodies. But when the transformation goes wrong, harmful mutations can cause the cells to start...

Can a paper bag really help you when you are hyperventilating? It turns out that it can. In part 2 of our look at your respiratory system Hank explains how your blood cells exchange oxygen and CO2 to maintain homeostasis. We'll...

Is personalized medicine for individual bodies in our future? Possibly -- with the use of stem cells, undifferentiated cells with the power to become any tissue in our bodies. Craig A. Kohn describes the role of these incredible,...