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+-SH safe2532330 +-SH artist:tiska33 +-SH imported from derpibooru3720775 +-SH pinkie pie302965 +-SH chemicals100 +-SH chemistry490 +-SH chemistry joke68 +-SH meme111230 +-SH solo1631330
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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