Hank has good news about NASA.

In which John Green teaches you about the war that was supposed to end all wars. Instead, it solved nothing and set the stage for the world to be back at war just a couple of decades later. As an added bonus, World War I changed the way...

We're still leading up to World War II, but first we gotta talk about the rise of the dictators. Today we talk about the rise of militaristic dictatorships in Germany, the Soviet Union, Japan, and Spain, and the economic depression that...

Besides being the deepest lake on Earth, Lake Baikal supports a bizarre collection of species that are found nowhere else!

Step one is probably having access to billions of dollars, but what about the following steps?

Many of the bewildering correlations in our world - like that between Beryllium-7 and the Asian monsoon - are a result of huge and unseen forces that tie them together.

History is written by the victors, as the saying goes -- but what would it look like if it was written by everyone? Journalist and TED Fellow Mikhail Zygar is on a mission to show us with Project1917, a "social network for dead people"...

In which John Green teaches you about World War II, and some of the causes behind the war. In a lot of ways, WWII was about resources, and especially about food. The expansionist aggression of both Germany and Japan were in a lot of ways...

Save the Vaquita Day is the first Saturday after the 4th of July, and it serves as a reminder that preventing extinctions means acting early.

So you know about Freshwater and Saltwater now and you know that there's not that much Freshwater for us (and other life) to get to. So how do different animals deal with different amounts of water where they live? In this episode of...

Vladimir Lenin overthrew Russian Czar Nicholas II and founded the Soviet Union, forever changing the course of Russian politics. But was he a hero who toppled an oppressive tyranny or a villain who replaced it with another? Alex Gendler...

Ever wonder what all those names on the periodic table actually mean? There's a whole lot of fascinating history on Mendeleev's table. Some carry names from antiquity, some are named for people, some are named for places, and some are...

Much has been written about what exactly caused World War I. As befits a true global war, the reality is that there isn't a single cause. There aren't even three causes. There are a vast array of causes. Today we'll get into just a few...

In which John Green teaches you how Russia evolved from a loose amalgamation of medieval principalities known as the Kievan Rus into the thriving democracy we know today. As you can imagine, there were a few bumps along the road. It...

Last time we learned about the Enlightenment, and the philosophers and thinkers whose ideas would shape governance for hundred of years. This week, we're learning how monarchs across Europe were influenced by those ideas. Adoption of...

We have discovered an enormous black hole that’s older and farther away than any we’ve ever seen, and a recent rocket launch did not go as planned.

We try not to get into too much great man history here at Crash Course, but we have to admit: Napoleon Bonaparte is a pretty big deal. Join us as we track the rise, further rise, fall, rise, fall, mortal fall, and posthumous rise of...

This video is about cutting, taping, and rearranging the periodic table into the Left Step form, the Mendeleev's flower form, the cake form, the wide form, the standard form, and so on. A great holiday...

At the end of our journey through modern European history, we're taking an episode to look back at how the practice of history developed and what the aim and goals and purpose of history have been. We'll also take time to consider how we...

Population statistics are like crystal balls -- when examined closely, they can help predict a country's future (and give important clues about the past). Kim Preshoff explains how using a visual tool called a population pyramid helps...

New ReviewRussia's first lunar lander mission in 47 years ended in failure when Luna-25 crashed into the moon. Credit: Space.com | footage and animation courtesy: Roscosmos | edited by Steve Spaleta

Top Kremlin official's chilling nuclear warning as treaty due to expireCredit: Dmitry Medvedev's Secretariat

Boy lifted from sinking car after it plunges into canalCredit: Social Media

During the Chechen wars Dr Khassan Baiev saved the lives of thousands of men, women and children. For his work he was sentenced to death by the Russian and the Chechen rebels and fled to live in the USA. After the war, he returned to...