If you're a regular Neatorama reader, than you probably already know that Egyptian mummies were regularly burned as firewood in the past, but you might not be aware of some of the other tragedies befalling historical artifacts featured in this great Cracked article. If you couldn't tell by the image, you might not want to read it right after eating lunch.
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Mummies were never used as firewood. Mark Twain made that up to get a laugh.
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