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Learn how blood flows through the heart, and understand the difference between systemic and pulmonary blood flow. Rishi is a pediatric infectious disease physician and works at Khan Academy….

In which John Green teaches you about the end of World History, and the end of the world as we know it, kind of. For the last hundred years or so, it seemed that one important ingredient for…

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Join Wisecrack! ▻▻ http://bit.ly/1y8Veir From plot debriefs to key motifs, Thug Notes’ Dante’s Inferno Summary & Analysis has you covered with themes, symbols, important quotes, and…

Here are 5 of the craziest things to ever happen through Craigslist! Visit our site: http://TopTrending.com Like us on Facebook: https://www.facebook.com/TopTrending Follow us on Twitter:…

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When is an organism not an organism? Or, when is it a bunch of different organisms living together? SciShow introduces you to the weird world of siphonophores. Hosted by: Michael Aranda ———-…

Here are 10 of the most unlucky people on the planet! Visit our site: http://TopTrending.com Like us on Facebook: https://www.facebook.com/TopTrending Follow us on Twitter: https://twitter.com/Top…

Have you ever seen a tree with a big, twisted knot growing out of it? That’s just one way that plants can show signs of cancer. Quick Questions explains. Hosted by: Hank Green ———-…