Ideally, their interactions with one another paints a colorful portrait of how our society is actually composed. There will always be those who are willing to cooperate and live peacefully, as well as those who make it a point to stir up trouble. Day contains a flavorful character scheme that allows viewers to relate with a single character on a deeper level. Day is also appealing because it challenges the idea of science. Everything cannot be explained by the scientific method or otherwise.
Day leaves that questionable gap between reality and science.
It also illustrates that a single person, no matter what their background entails, is not genius enough to save mankind and figure nature's deepest mysteries.