Bozeman Science
Speciation
Paul Andersen explains how reproductive isolation can eventually lead to speciation. Three main barriers to gene flow are included: geographic, pre-zygotic and post-zygotic. Both allopatric and sympatric speciation are discussed. A brief...
PBS
History's Most Powerful Plants
Fossil fuels are made from the remains of extinct organisms that have been exposed to millions of years of heat and pressure. But in the case of coal, these organisms consisted largely of some downright bizarre plants that once covered...
Bozeman Science
Homeostatic Disruptions
Paul Andersen explains how disruptions in homeostasis can affect biological systems at all levels. He uses the example of dehydration in animals to explain how disruptions at the cellular level can affect an organism. He also uses the...
Crash Course
Income and Wealth Inequality: Crash Course Economics
Inequality is a big, big subject. There's racial inequality, gender inequality, and lots and lots of other kinds of inequality. This is Econ, so we're going to talk about wealth inequality and income inequality. There's no question that...
SciShow
How Apple Flies Changed the Way We Think of Evolution
How does one species evolve into two within the same habitat? Discover the details behind a rare type of evolution: sympatric evolution.
SciShow
9 Poisonous Plants You Might Have Around Your House
Houseplants can be great for your mental health, but eating some of them can be far worse for your bodily health than you might think. Chapters View all DIEFFENBACHIA 0:47 2 DAFFODILS 2:44 OLEANDER 3:42 RHODODENDRONS 4:39 LILY OF THE...
Crash Course
Evolution: It's a Thing - Crash Course Biology
Hank gets real with us in a discussion of evolution - it's a thing, not a debate. Gene distribution changes over time, across successive generations, to give rise to diversity at every level of biological organization.
SciShow
These Trees Eat Salmon!
Fish-eating trees sound like they’re straight out of science fiction. But they’re a real thing—one that exists right here on Earth. And they show just how interconnected life on this planet is.
TED-Ed
TED-Ed: The rise and fall of the Lakota Empire | Pekka Hämäläinen
In 1776, a powerful empire was born in North America. The Lakotas had reached the Black Hills, the most sacred place and most coveted buffalo hunting grounds in the western plains. Located in what is now South Dakota, control of the...
Crash Course
The Seven Years War Crash Course World History
In which John teaches you about the Seven Years War, which may have lasted nine years. Or as many as 23. It was a very confusing was. The Seven Years War was a global war, fought on five continents, which is kind of a lot. John focuses...
Crash Course
North America Gets a Theater...Riot: Crash Course Theater #29
It's lights up in America! This week, we're headed to North America. We'll look at Native American storytelling traditions, the theater that Europeans brought along starting in the 17th century, and how theater developed before and after...
Crash Course
The Vikings! - Crash Course World History 224
In which John Green teaches you about Vikings! That's right, one of our most requested subjects, the Vikings, right here on Crash Course. So what's the deal with Vikings? Well, the stuff you've heard about them may not be true. The...
SciShow
The Complicated Lives of Mountains | Compilation
It’s easy to discount the history and evolution of mountains on our jagged world, but they really hold an immense amount of information about history within them. From mountain ranges in space, to why Earth isn’t a waterworld, here are...
Bozeman Science
Ecosystem Change
Paul Andersen explains how ecosystems change over time. He starts by explaining how global climate change will impacts ecosystems around the planet. He then discusses how continental drift created climatic changes that impacted mammal...
TED-Ed
TED-ED: The colossal consequences of supervolcanoes - Alex Gendler
In 1816, Europe and North America were plagued by heavy rains, odd-colored snow, famines, strange fogs and very cold weather well into June. Though many people believed it to be the apocalypse, this "year without a summer" was actually...
Crash Course
The Plate Tectonics Revolution: Crash Course Geography
Today we're going to tell the story of a quiet revolution in the 1960s that shifted our entire understanding of how the Earth works. We currently believe that the Earth's broken outer shell rises from the mantle and folds back in - kind...
Crash Course
Community Ecology II: Predators - Crash Course Ecology
Hank gets to the more violent part of community ecology by describing predation and the many ways prey organisms have developed to avoid it.
PBS
From the Fall of Dinos to the Rise of Humans
After taking you on a journey through geologic time, we've arrived at the Cenozoic Era. Most of the mammals and birds that you can think of appeared during this era but perhaps more importantly, the Cenozoic marks the rise of organisms...
SciShow
What Really Killed the Dinosaurs
What wiped out the dinosaurs? Most of us were taught it was a killer asteroid—which is true. But it turns out there was more than one disaster movie playing at the cineplex that was Earth 66 million years ago.
Crash Course
The Seven Years War and the Great Awakening Crash Course US History
In which John Green teaches you about the beginnings of the American Revolution in a video titled The Seven Years War. Confusing? Maybe. John argues that the Seven Years War, which is often called the French and Indian War in the US,...
SciShow
4 Billion Years in Under 10 Minutes
Have you ever wondered how our earth was created? Here is a brief history about the Earth.
PBS
The Whole Saga of the Supercontinents
The study of natural history is the study of how the world has changed but Earth itself is in a constant state of flux -- because the ground beneath your feet is always moving. So if we want to know how we got here, we have to understand...
TED Talks
TED: The intended consequences of helping nature thrive | Ryan Phelan
From a special black-footed ferret to coral that can withstand warming waters, genetic rescue efforts that use genomics and synthetic biology are helping nature thrive. But despite the huge successes of this kind of intervention,...