 In 2006 , a physics professor at the University of Central Florida wrote a paper arguing that it is mathematically impossible for vampires to exist , based on geometric progression . According to the paper , if the first vampire had appeared on 1 January 1600 , and it fed once a month ( which is less often than what is depicted in films and folklore ) , and every victim turned into a vampire , then within two and a half years the entire human population of the time would have become vampires . The paper made no attempt to address the credibility of the assumption that every vampire victim would turn into a vampire . 
