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Explain xkcd: It's 'cause you're dumb.
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Nostalgia Content
Gen-Z got a chunk of the Carboniferous, and now all their memes are about how pathetic and small today's dragonflies are.
Title text: Gen-Z got a chunk of the Carboniferous, and now all their memes are about how pathetic and small today's dragonflies are.

Explanation

This comic is a joke about nostalgia content. In it, a database for creating nostalgia content has accidentally included some Early Devonian features in it. These features, while certainly being old, are far too long ago for anyone to be alive at the time, let alone remember it, hence defying the purpose.

Prototaxites (here, Parataxites) were huge funghi that lived during the Devonian. The armoured fish Cueball speaks of are from an ancient class known as Placodermi, which appeared during the Silurian and Devonian. Placoderms were among the first jawed fish, and the first fish clade to have pectoral fins. Devonian placoderms include Dunkleosteus, Titanichthys, Bothriolepis and Rhamphodopsis. Silurian placoderms include Xiushanosteus, Anglaspis, and Poraspis. There was also Sacabambaspis from the Ordovician.

Transcript

[Cueball is standing, with his arms out, in front of a prototaxite (incorrectly refered to in this comic as a 'parataxite') towering over a mossy landscape. To his right, a Tamagotchi, and milk-caps (refered to in this comic as "pogs"), appear.]
Cueball: Who else rembembers pogs? Tamagotchis? Vast forests of Parataxites towering over the mossy landscape as armored fish stir in the deep?
[Caption below the panel:]
Due to a database error, Millenial nostalgia now includes a portion of the early Devonian.

Trivia

Cueball has incorrectly refered to the huge funghi as Parataxites. They are actually called prototaxites.



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