Pandemics do spread very quickly because we all, humans live in close connection to one another. A single sneeze of one person can spread the viral infection to many others who are close by. However, the case was different in early times when humans were huntsmen. During that period, humans were nomads, which decreased the risk of disease transmission. Now, people began to stay amidst animals for a long time favoring the bacterial and viral spread between animals to humans, humans to animals, and humans to humans. Since then, epidemics and pandemics show up in different forms.

Even though scientists were doing a great job by developing vaccines, discovering antibiotics, sequencing the human genome, and many more, efforts to cure cancer often failed. Do you know why? Here’s the reason: