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tHE lEG­End: Un­dead peo­ple suck­ing blood af­ter dark. tHE SCI­EnCE: A re­cent study the­o­rized peo­ple la­belled vampires may have had ery­thro­poi­etic pro­to­por­phyria, which causes sen­si­tiv­ity to light and ane­mia, mak­ing suf­fer­ers pale and, per­haps, apt to drink blood to re­plen­ish their iron. A 1998 pa­per in His­tor­i­cal Neu­rol­ogy sug­gested the same for ra­bies, with symp­toms like light sen­si­tiv­ity and bloody foam around the mouth. Plus, you can get it from a bat. tHE lEG­End: tHE SCI­EnCE:

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