Survival of the fittest. Raw competition? Or, a level of cooperation indispensable to life? Evolution tells us that both are important. We explore our own spiraling arms race with microorganisms, the only entities that can pose a threat to our existence. We follow the struggles of medical detectives uncovering the roots of epidemics and trace the alarming spread of resistance among pathogens that cause disease, like the new virulent tuberculosis--nicknamed "Ebola with wings." Interactions between species are among the most powerful evolutionary forces on earth, and understanding them may be key to our own survival.
