Annually, we shower over 5 billion pounds of pesticides across the Earth to control insects, unwanted weeds, funguses, rodents, and bacteria that may threaten our food supply. But is it worth it, knowing what we do about the associated...

It’s true. You have tiny mites living all around your face. But who are they? And how did they get there? QQ has the A!

Many animals use the same five senses as we do, but these creatures take that beyond the next level.

When ultraviolet sunlight hits our skin, it affects each of us differently. Depending on skin color, it'll take only minutes of exposure to turn one person beetroot-pink, while another requires hours to experience the slightest change....

Inside our cells, each of us has a second set of genes completely separate from our 23 pairs of chromosomes. And this isn't just true for humans— it's true of every animal, plant, and fungus on Earth. This second genome belongs to our...

High elevations can be a problem for humans. Since the air is thinner, you get less oxygen with every breath, leading to all kinds of negative side effects. But there are millions of people around the world who spend their whole lives at...

After weeks of discussion of human reproduction, today we arrive at the main event: THE SEX. Hank explains the four phases of the human sexual response, how a sperm finds and fertilizes an egg, creating a zygote, and how different...

Animals like bats and dolphins navigate the world using echolocation, but there’s also another animal capable of such a feat: humans.

When it comes to our blood-producing stem cells, biologists have learned that bigger is not better. And a study has taken a look at the accomplishments and obstacles of an in-progress attempt to restore a large belt of degraded land...

Even if you have a dog of your own, we bet you don’t know these three amazing things about our furry best friends!

Paul Andersen describes four important homeostatic loops in biology. He begins with a brief description of the elements of a homeostatic loop. He then describes how the hypothalamus helps us maintain a stable internal body temperature....

Do We Have to Get Old and Die?

Our early ancestors relied on lightning to cause forest fires, from which they could collect coals and burning sticks to help them cook food and clear land. Yet, it wasn't just humans who benefited from these natural phenomena. Even as...

Because biological limbs are connected to our skeletons, we don't notice that they weigh a lot! As technology develops, scientists have designed lighter, more functional prostheses and the latest can even use the skeleton like a...

When you think of surfactants, you might think of soaps, detergents and other man-made chemicals. But it turns out that some other animals utilize their own versions of these sudsy molecules.

Improve your understanding of molecular properties with this lesson on the fascinating property of chirality. Your hands are the secret to understanding the strange similarity between two molecules that look almost exactly alike, but are...

A quarter of all prescription drugs in the U.S. come from substances that are found only in plants. In this episode of SciShow, we take a look at four of these talented plants who make our lives better.

While humans age and die (which is kind of a bummer), it looks like hydras will stay young and fertile forever. Why is this? And what can we learn from these tentacular microscopic organisms?

You probably know that sweating is a way for your body to cool off, but how does it help? And why don't other animals, like cats of dogs sweat? Join Jessi and Squeaks to learn all the answers to these questions and more!

Despite water covering 71% of the planet’s surface, more than half the world’s population endures extreme water scarcity for at least one month a year. Current estimates predict that by 2040, up to 20 more countries could be...

Nothing is guaranteed in life except death, taxes, and entropy. What do other life forms have to teach us about staying alive as we get old, and will we ever conquer death?

Thanks to the Space Telescope Science Institute (STScI) and NASA's James Webb Space Telescope for supporting this video! In particular, thanks to Dan Coe of STScI for taking the time to chat with me about what we do and don't know about...

In 1958, after receiving a letter describing the deaths of songbirds due to the pesticide known as DDT, Rachel Carson began an investigation into the misuse of chemicals and their toll on nature. In 1962, she published her findings in...

Nausea and vomiting are common side effects of severe pain, but why do our bodies do this!?