Why do antibiotic super bugs keep evolving more and more so they are resistant to antibiotics? Wouldn't this evolution be considered on a macroscale or would you say microscale seeing as how they are becoming stronger and stronger? It's interesting to learn that these things are becoming more and more powerful through last century and this century. Why do these things evolve so quickly and yet we as humans don't really have a greatly evolving immune system? Things like this make me wonder if it is somehow attached to a radiation source on earth we haven't discovered.. perhaps from the nukes in the 50s?