From time to time we notice the appearance of a resistant microorganisms to antibiotics, and also the appearance of a new deadly microorganisms. What are the reasons do you think of that?
Nothing in the world is actually static. The old gives way to the new. It's all about of new challenges, new thought processes, new discoverers of new discoveries, new world powers, new centers of attention. It's like in the theater, new scenes demand the old occupants of the stage exit. Change is a constant.