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Crash Course Anatomy & Physiology Preview

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We made flashcards to help you review the content in this series! Find them on the free Crash Course App!

Which Diets Actually Work?

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Debunking some common diets, and seeing which work!

An Egg Is Just One Cell

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One of Earth's biggest cells is one you're probably really familiar with.

Why do cats have vertical pupils? - Emma Bryce

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Dive into the incredible diversity of animal pupils, and how the different shapes indicate the animal’s role in an ecosystem.

What Happens To Your Body When You Stop Drinking Alcohol

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Drinking alcohol is one of the most popular things to do across the globe. Some people spend their entire weekends sitting at the bar, but consuming alcohol on a daily or weekly basis can have extremely negative effects on the body.

You Are Immune Against Every Disease

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You are not a person, you are a planet, made of roughly 40 trillion cells. There is so much of you, that if your cells were human-sized, you would be as big as 20 Mount Everests.

Catching Criminals Using Their Relative's DNA

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Your genetic code is probably already in a database, without you ever giving a sample or permission.

You could have a secret twin (but not the way you think) - Kayla Mandel Sheets

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While searching for a kidney donor, Karen Keegan stumbled upon a mystery. After undergoing genetic testing, it turned out that some of her cells had a completely different set of genes from the others.

This Virus Shouldn't Exist (But it Does)

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Hidden in the microverse all around you, there is a merciless war being fought by the true rulers of this planet, microorganisms.

How Fevers REALLY Work

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Fevers are one of our best weapons against infections, but they don't work like you might think.

Why It's Good To Have A Weak Hand

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We might have a strong hand because having a weak hand is actually useful.

Human Body 101 | National Geographic

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How does the human body work? What roles do the digestive, reproductive, and other systems play?

Which Will Kill You First?

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The body can get a whole lot colder - but not a whole lot hotter - before we die. Why is that?

How fast is the speed of thought? - Seena Mathew

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Travel into the brain to see how its network of neurons transmit your thoughts and what factors determine how quickly you think.

How Large Can a Bacteria get? Life & Size 3

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In and out, in and out. Staying alive is about doing things. This very second, your cells are combusting glucose molecules with oxygen to make energy available, which keeps you alive for another precious moment. To get the oxygen to your cells you are breathing.

Which type of milk is best for you?

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Dive into the most popular milks— dairy, almond, soy and oat— to find out which is healthiest for you and for the planet.

The surprising effects of pregnancy

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Discover how pregnancy changes every organ in the body— from the heart, to the brain and kidneys— and what we still don’t know about it.

Is Dust Mostly Dead Skin?

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People claim that 70-80% of household dust is dead skin, but is it true?

Staying Up VS Sleeping In ft. Juniper

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We're guilty of one of them. Which is worse? What are the downsides?

Eating 10,000 Calories a Day for 1 Week - Food Challenge

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If you've ever watched "Game of Thrones" you know of the hulking character by the name of "The Mountain".

What yoga does to your body and brain - Krishna Sudhir

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Explore the ancient tradition of yoga, and discover how its blend of physical and mental exercise impacts your health.