A bit on Vampires !

If vam­pires—corpses that rise up to suck the blood of the liv­ing—sound bi­o­log­i­cal­ly im­plau­si­ble to you, you’re not alone. They ex­ist pure­ly in leg­end, as vir­tu­al­ly all sci­en­tists agree.If vam­pires ever ex­isted in the forms in which mo­v­ies and books por­tray them, they would have quick­ly wiped out hu­ma­n­ity long ago, ac­cord­ing to phys­ics pro­f­es­sor Cos­tas Ef­thi­mi­ou of the Uni­ver­si­ty of Cen­tral Flor­i­da in Or­lan­do, Fla.Pop­u­lar lo­re pas­sed down through cen­turies holds that vam­pire vic­tims be­come vam­pires them­selves, and launch their own blood-hunts on hap­less hu­mans.
“If vam­pires tru­ly feed with even a ti­ny frac­tion of the fre­quen­cy that they are de­picted to in the mo­v­ies and folk­lore, then the hu­man race would have been wiped out quite quick­ly af­ter the first vam­pire ap­peared,” Efthimiou sup­posed that the first vam­pire arose Jan. 1, 1600, around the be­gin­ning of a cen­tu­ry dur­ing which some of the first im­por­tant mod­ern writ­ings on vam­pires ap­peared. The re­search­ers es­ti­mat­ed the glob­al pop­u­la­tion at that time, based on his­tor­i­cal re­c­ords, as 537 mil­lion.As­sum­ing that the vam­pire fed once a month and the vic­tim turned in­to a vam­pire, there would be two vam­pires on Feb. 1, four the next month, and eight the month af­ter that. All hu­mans would be vam­pires with­in 2½ years. “Hu­mans can­not sur­vive un­der these con­di­tions, even if our pop­u­la­tion were dou­bling each mon­th,” which is well be­y­ond hu­man ca­pa­ci­ties.

Frankly Speaking, they din't count Fast Days ! !!