The world is in the midst of the deadly Covid-19 pandemic . An increment in the numbers of daily cases around the world is terrifying. The researchers are working hard and round the clock to find a vaccine to this deadly virus. A number of vaccines are going through different phases. But how much efficient should a vaccine be to stop the pandemic? Let us learn about the minimum efficiency required and the various vaccines in making. Will a vaccine alone be enough to stop the pandemic? It depends on the efficiency of a vaccine. A vaccine with a higher efficiency rate might be able to stop this pandemic whereas a vaccine with low efficiency rate might not be enough to stop this pandemic alone. What Does the Computer Simulations Show? The computer simulations introduces the Covid-19 virus with the virtual population with different ways and can show scenarios spreading it from person to person. The results of the simulation indicates how vaccin...