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+-SH safe2533653 +-SH artist:tiska33 +-SH imported from derpibooru3722574 +-SH pinkie pie303100 +-SH chemicals100 +-SH chemistry490 +-SH chemistry joke68 +-SH meme111268 +-SH solo1632331
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The text says "polymethyl methacrylate is a bad heat conductor". If there is a joke, then it's pretty unfunny.
hmmm