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Explain xkcd: It's 'cause you're dumb.
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Snake Facts
Biologically speaking, what we call a 'snake' is actually a human digestive tract which has escaped from its host.
Title text: Biologically speaking, what we call a 'snake' is actually a human digestive tract which has escaped from its host.

Explanation

{{The comic lists a few 'factoids' about snakes, ranging from the mildly informative to the strictly tongue-in-cheek. The first factoid references the hypothesis that snake venom was an evolutionary development of saliva that, over time, gradually became more toxic as snakes with saliva that was able to subdue their prey possessed an evolutionary advantage. It then posits that the entire evolutionary branch that developed in venomous snakes began with a snake whose mutation gave him a mouth that was 'slightly more gross than usual'.

The second factoid references the 'longest snake in the world', citing a South American habitat. Given the habitat listed, it is possible the comic is referring to the Green Anaconda (Eunectes murinus), but the Green Anaconda, while an impressive creature and one of the longest snakes in the world, is generally not as long as the Reticulated Python (Python reticulatus) of Southeast Asia, which is generally recognized as the world's longest snake, though not its largets. The factoid then states that the world's longest snake is 'believed to be over 60 years old'. As Anacondas generally do not live beyond 20 years in captivity, and likely less in the wild, the factoid appears to be in error once again, and may simply be a playful attempt to mislead the reader into reading the first portion of the factoid (longest snake) and then, when skimming, see the number 60 in the second part and inadvertently come to the conclusion that the longest snake is over 60 feet long.

The final factoid is entirely tongue-in-cheek, beginning with a typical factoid trope in which a collection of related items are laid end-to-end, then the length is compared to something else in a way intended to surprise the reader that the collection of items is indeed, so extensive (literally and figuratively). For example, "If you laid all the veins and arteries in the human body end-to-end, they would stretch 60,000 miles". The third factoid takes the form of that trope and turns it into a joke, "If you laid all the bones in a snake end to end, you would have a snake." Obviously, you would not have an entire snake, literally, but you would have a skeleton that was recognizably that of a snake and could reasonably be referred to as 'a snake', albeit a skeletal one.

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