Museums would like you to know the truth about 'Game of Thrones' Dragonglass

Is there a corner of culture untouched by Game of Thrones? Absolutely not.
In advance of Sunday's Season 8 premiere, museums around the world have been getting in on the Thrones fandom, in the best way they know how: by being extremely helpful and informative! 
In Game of Thrones, one of the few ways to kill a White Walker or wight is with a tool made of Dragonglass — or, as Samwell Tarly informed us all in Season 2, "the Maesters call it obsidian."
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