Crash Course is an educational YouTube channel started by Hank and John Green, two brothers who provide some excellent video explanations and tutorials on a variety of topics related to World and US History, Biology, Literature, Ecology and Chemistry.
Crash Course launched a preview on December 2, 2011. As of January 25, 2015, the channel has earned over 2.6 million subscribers and over 200 million video views.
(Source: Wikipedia)
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