In the millions of years since oxygen began saturating Earth’s oceans and atmosphere, most organisms have evolved to rely on this gas. However, there are some places where oxygen-averse microorganisms like those from Earth’s earliest...

In this SciShow Kids compilation, Jessi and the gang learn about axolotls, poison dart frogs, and an amphibian with a boomerang-shaped head. <br/>

Join Squeaks as he learns about some of the most colorful animals ever: poison dart frogs! Some animals are bright and colorful to warn other animals that they might be dangerous... and some are just...

The world of snakes is pretty mysterious: maybe you fear them, love them, or respect them from afar, but we can't help but wonder what is it about snakes that makes them so fascinating? Join us for a fun SciShow compilation of everything...

Turns out humans aren't the only animals that can medicate themselves - many other animals have found ways to deal with illness by using natural remedies. Hank will tell you about some of the most interesting methods animals have found...

Lead is really useful when you add it to things like paint and gasoline. Problem is, it’s also poisonous. Hosted by: Hank Green

At the heart of alchemy was the quest to turn ordinary metals into gold. Despite the hopelessness of that goal, alchemists still made a lot of discoveries that formed the foundation of modern chemistry and medicine.

Would you rather be bitten by a venomous rattlesnake or touch a poisonous dart frog? While both of these animals are capable of doing some serious damage to the human body, they deliver their dangerous toxins in different ways. Rose...

Paul Andersen explains how aposematic coloration (or warning coloration) is used for protection in the natural world. He explains how bright colors can be caused by either sexual selection or a warning coloration to predators. He also...

Hank goes head-to-head with Minute Physics’ Henry Reich to test their wits about the winter solstice, reindeer, and the science of snow! Chapters View all HANK GREEN 0:20 HENRY REICH 0:28 MAX LOUTZENHEISER 1:03 FLORIAN STINGLMAYR 1:06...

Humans have been processing plants for their narcotic effects for at least 5000 years, historically for ceremonial purposes, to deal with harsh environmental conditions or difficult situations, and sometimes even to supplement...

What is it about snakes that intrigues us so much? Is it their deadly venom, their spongey mouths, or their international travel?

Turns out humans aren't the only animals that can medicate themselves - many other animals have found ways to deal with illness by using natural remedies. Hank will tell you about some of the most interesting methods animals have found...

While it’s true that most snakes aren’t considered poisonous, there definitely are poisonous snakes, with poison for their predators and venom for their prey.

Lead is really useful when you add it to things like paint and gasoline. Problem is, it's also poisonous.

A woman in rags emerged from a swamp flanked by seven giant scorpions and approached a magnificent mansion to beg for food. But the mistress of the house took one look at her grimy clothes and unusual companions and slammed the door in...

We used to think having a distinct left and right brain was something unique to humans. But brain lateralization has now been found in everything from chickens to spiders! Does this change our theories for why some brains work that way?

Jessi and Squeaks learn about plants with defensive weapons!

Science Kids Animals From Down Under - Australia's Furry And Feathered Friends V1-0002

Koalas are iconic Australian marsupials known for their adorable appearance and unique lifestyle. They spend most of their time sleeping due to...

Howcast - Learn if tarantulas are poisonous from Jungle Bob in this Howcast video.

Howcast - If you don't want a pet goat to get rid of your poison ivy, there are other ways to get the job done.

Learn all about different kinds of venomous pit vipers, including the Mexican lance-head rattlesnake, the Bushmaster, the Sri Lankan pit viper, and the Eastern diamondback rattlesnake - if you dare.

But when it comes to gopher tortoises, indigo snakes can make great roommates.

Uncover the fascinating transformation of ketchup from its origins as a Chinese fish paste to its reinvention with tomatoes in America, becoming a national symbol.<br/>