Your heart beats more than 100,000 times a day. In just a minute, it pumps over five liters of blood throughout your body. But unlike skin and bones, the heart has a limited ability to repair itself. So if this organ is severely damaged,...

Are you afraid of black cats? Would you open an umbrella indoors? How do you feel about the number 13? Whether or not you believe in them, you're probably familiar with a few of these superstitions. But where did they come from? Stuart...

The word "normal" is often used as a synonym for "typical," "expected," or even "correct." By that logic, most people should fit the description of normal. But time and time again, so-called normal descriptions of our bodies, minds, and...

Humans are special, and we got that way thanks to evolution and natural selection. The proof is right there in our bodies! From anatomy to genes, here are some stories of how you got to be the way you are.

The Golden State Killer was finally caught last week after more than 40 years, but the science behind it wasn’t just your everyday DNA forensics.

Several companies are developing 3D printers that might eventually be able to print organs...in space! What!?

Whether you're out camping, cooking, or snuggled up in front of your fireplace, you know that fire is hot! But why? Join Jessi and Squeaks to learn how fires turn wood or other fuel into useful heat!

Do you remember having a cold in 5th grade? Or the flu a couple years ago? Your immune system does. Our bodies hold many levels of immune defense. Millions of B cells and T cells and antibodies are constantly on patrol for germs and...

We can all appreciate pretty shiny things, but what makes them shiny?

Why is Earth is a blue planet? Because it's covered in water! Where did Earth's water come from? Of course, water isn't unique to our planet. The origin of water traces beyond the solar system to the earliest days of the universe. Here's...

The tale of a major global cultural phenomenon: Cricket commentator Harsha Bhogle describes the spectacular arrival of fast-paced 20-20 cricket as it parallels the rise of modern India. He traces the game from its sleepy English roots to...

The wave model of the electron can be used to explain the Bohr model. Electrons are found in certain orbits because they interfere with themselves and create standing waves. When the wavelengths don't match up with a whole integer they...

Group projects have a reputation of being difficult at times. But there are ways to make sure everything from the project to meetings about the project go smoothly. In this episode, Evelyn chats about how we can make sure and avoid...

Explore the science of the groundbreaking technology for editing genes, called CRISPR- Cas9, and how the tool could be used to cure diseases. -- From the smallest single-celled organism to the largest creatures on Earth, every living...

Using the fundamentals of set theory, explore the mind-bending concept of the "infinity of infinities" -- and how it led mathematicians to conclude that math itself contains unanswerable questions.

Everybody has their own preferences for ideal romantic partners. But what affects you when you decide your “type," and do those types even matter?

Bones might seem rock-solid, but they’re actually quite porous inside. Most of the large bones of your skeleton have a hollow core filled with soft bone marrow. Marrow's most essential elements are blood stem cells and for patients with...

Birthday math has never been more fun.

Paul Andersen explains how paraffin vapor combusts in a candle. He also describes energy and mass conversion and almost burns himself.

A SciShow kid wrote us and asked: What is camouflage and how does it work? Join Jessi as she explores how different kinds of animals play hide-and-seek in the wild!

When we began mass-producing matches in the 1800s, workers in the factories started dying mysteriously. The history of our sparking little flame-sticks is darker than you think.

We've talked about mixtures and solutions, solutes and solvents, but what about things that can't be undone? What about Chemical Changes? Would it surprise you to know that baking a cake is a Chemical Change? Or striking a match? In this...

In this video Paul Andersen explains how scientific theories are created and modified over time. He starts by discussing the theory of natural selection as a model for the creation and modification of theories. He gives examples of...

Whether she's describing bickering families, quiet declarations of love, or juicy gossip, Jane Austen's writing often feels as though it was written just for you. Her dry wit and cheeky playfulness informs her heroines, whose...