Many animal species stuff themselves with toxic chemicals for protection, which forces them to use a handful of distinct strategies to avoid becoming victims of their own weapons.

Paul Andersen explains the major elements in the endocrine system. He explains how glands produce hormones which target cells. He differentiates between water soluble and lipid soluble hormones. He then describes the hormones and...

You're probably aware of lots of the things we take from animals, but for centuries, humans have been sneaking animal secretions into a bunch of things you probably didn't know about, like your Easter candy, your Mom's perfume, and even...

Do you just hate those little bumps all over your nose? Don’t be a hater, they’re just doing their job! Learn how in this SciShow Quick Question.

They get a rap for being spooky, but whether it’s building bridges across rivers or solving puzzles, spiders are way cooler than you might think. Many have smart or elaborate features that allow them to do some pretty extraordinary...

We’ve been studying the body for most of human history, and yet we are still finding new organs (or parts of them - depending on your definition). Also, thanks to some marmosets, we know a little more about how anxiety and depression...

Mosquitoes transmit a number of terrible diseases like malaria, West Nile virus, and the Zika virus, but why not the flu?

Thousands of animal species use toxic chemicals to defend themselves from predators. Snakes have blood clotting compounds in their fangs, the bombardier beetle has corrosive liquid in its abdomen and jellyfish have venomous, harpoon-like...

Our friend the Giant Squid inspired a SciShow Kids viewer to write us and ask, 'What is squid ink, and can you write with it?' Jessi has the answers!

Hank faces off against his Crash Course co-worker Evelyn from the Internets in this test of wits and sticky science knowledge! Who will win and who will lose?

You’ve seen dogs pant, but do you know why they do it? And is it true that dogs can’t sweat? Quick Questions has the answers!

Ever wonder what that dangling thing in the back of your throat is good for? Hank Green explains in this episode of SciShow Quick Questions.

Whether it’s building bridges across rivers or solving puzzles, spiders are way cooler than you might think. Many have smart or elaborate features that allow them to do some pretty extraordinary things!

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BAHHHHHH! Did I scare you? What exactly happens when we get scared? How does our brain make our body react? Just what are Neurotransmitters? In this episode of Crash Course Psychology, Hank takes us to the simplest part of the complex...

There’s lots of debate as to which original starter Pokémon is the best fighter among squirtle, bulbasaur, charmander, and pikachu, but only one is the most biologically plausible.

You're probably aware of lots of the things we take from animals, but for centuries, humans have been sneaking animal secretions into a bunch of things you probably didn't know about, like your Easter candy, your Mom's perfume, and even...

Paul Andersen explains the major elements in the endocrine system. He explains how glands produce hormones which target cells. He differentiates between water soluble and lipid soluble hormones. He then describes the hormones and actions...

Explore the endocrine system with the Amoeba Sisters! This video briefly discusses endocrine vs exocrine before showing major endocrine glands and discussing examples of hormones released by each gland. Video also provides an example of...

No Judging: At one point you've probably put a finger in your ear and dug out some rather unsightly ear wax, but why does your body produce this yellowy substance in the first place?

In this video Paul Andersen details the important structures and functions of the integumentary system. The integumentary system includes the skin, hair and nails in humans.

Claws and teeth are one way to catch a meal, but here are six animals that have evolved some pretty unique hunting techniques. Chapters FROGFISH 0:51 BOLAS SPIDERS 2:16 3 HUMPBACK WHALES 4:22 PISTOL SHRIMP 5:19 8:14 HUMANS 8:39

Have you ever gone through your laundry and noticed unsightly yellow stains in all of your white shirts? If your sweat isn't yellow, what's causing this?

Hank takes you on a tour of your two-part autonomic nervous system. This episode explains how your sympathetic nervous system and parasympathetic nervous system work together as foils, balancing each other out. Their key anatomical...

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!