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Updated by Natasha Hervatta on Feb 18, 2017
Headline for Your guide to John & Hank Green's Crash Course videos
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Your guide to John & Hank Green's Crash Course videos

Ever wanted to learn about a particular topic, in a very short time? Let the Vlog Brothers help you out! Through these videos, John & Hank Green and friends teach you all kinds of subjects - from World History to Astronomy, Literature to Psychology, and everything in between! Click through the slideshow to know about each category..

Introduction

Here's an introduction from John and Hank Green, to tell you what Crash Course is all about.