A team from the University of Leicester, England, decided to investigate how long humanity would be decimated in a possible zombie apocalypse. According to the researchers, after 100 days there would be only 273 people walking alive on Earth! The conclusion was made possible after an unrealistic analysis of the epidemiological model SIR, which calculates the spread of disease.

It was assumed that each zombie would have a 90% chance of infecting a new human a day - a prospect that would put this epidemic twice as fast as the Black Death, which ravaged Europe in the 1300s. With a population of 7.5 billions of people in the world, it would only take 20 days for a single zombie to start a global pandemic.

Study looked at a real epidemiology model to get results

Without geographical isolation, in 100 days the world's population would fall to a mere 181 people. If there was some isolation, the count could be a little more “positive”: 273 people. One must know, however, that the researchers did not take into account the fact that humanity could fight against zombies. In the calculations, it would be as if we were inert waiting for the right death.

University students also stipulated that zombies could survive up to 20 days without any brains. In this model, they say, brain eaters would be gone within 1, 000 days of the outbreak, and humanity would recover after 10, 000 days. There's time for such a bizarre calculation, huh?