Math vs. vampires: vampires lose
Efthimiou supยญposed that the first vamยญpire arose Jan. 1, 1600, around the beยญginยญning of a cenยญtuยญry durยญing which some of the first imยญporยญtant modยญern writยญings on vamยญpires apยญpeared. The reยญsearchยญers esยญtiยญmatยญed the globยญal popยญuยญlaยญtion at that time, based on hisยญtorยญiยญcal reยญcยญords, as 537 milยญlion. Asยญsumยญing that the vamยญpire fed once a month and the vicยญtim…