What is Engineering?: Crash Course Engineering #1

In our first episode of Crash Course Engineering, Shini explains what engineering is, and gives a brief overview of its four main branches (civil, mechanical, electrical, and chemical) as well as a... Read more »

The Crusades – Pilgrimage or Holy War?: Crash Course World History #15

In which John Green teaches you about the Crusades embarked upon by European Christians in the 12th and 13th centuries. Our traditional perception of the Crusades as European Colonization thinly veiled in... Read more »
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Locke, Berkeley, & Empiricism: Crash Course Philosophy #6

This week we answer skeptics like Descartes with empiricism. Hank explains John Locke’s primary and secondary qualities and why George Berkeley doesn’t think that distinction works — leaving us with literally nothing... Read more »

Redox Reactions: Crash Course Chemistry #10

All the magic that we know is in the transfer of electrons. Reduction (gaining electrons) and oxidation (the loss of electrons) combine to form Redox chemistry, which contains the majority of chemical... Read more »

The Cold War in Asia: Crash Course US History #38

In which John Green teaches you about the Cold War as it unfolded in Asia. As John pointed out last week, the Cold War was occasionally hot, and a lot of that... Read more »

Medieval Europe: Crash Course European History #1

Our European history is going to start around 1500 with the Renaissance, but believe it or not, that is not the actual beginning of history in the continent. So, today, we’re going... Read more »

Population Genetics: When Darwin Met Mendel – Crash Course Biology #18

Hank talks about population genetics, which helps to explain the evolution of populations over time by combing the principles of Mendel and Darwin, and by means of the Hardy-Weinberg equation. Table of... Read more »

Luther and the Protestant Reformation: Crash Course World History #218

In which John Green teaches you about the Protestant Reformation. Prior to the Protestant Reformation, pretty much everyone in Europe was a Roman Catholic. Not to get all “great man,” but Martin... Read more »

World War II: Crash Course World History #38

In which John Green teaches you about World War II, aka The Great Patriotic War, aka The Big One. So how did this war happen? And what does it mean? We’ve all... Read more »

The Nervous System, Part 1: Crash Course Anatomy & Physiology #8

Today Hank kicks off our look around MISSION CONTROL: the nervous system. Pssst… we made flashcards to help you review the content in this episode! Find them on the free Crash Course... Read more »