Yawning is so contagious that it can spread to dogs and monkeys.
In this week's episode, John Green goes through some less-intelligent facts about sugary treats.
From bears and storks to singing wolves and castrated sheep, all 16 of the words listed here have surprising zoological origins.
This week's new comics include a comic about a meme that causes the end of the world. Plus, Sabrina the Teenage Witch.
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