We all know about the dangers of living a modern life. There are risks when we get behind the wheel of a car, or when we meet a stranger on the street. We can reduce these foreseen risks if we practice defensive driving or avoid contact with suspicious individuals. There are also hundreds of unforeseen risk that we face every day. The world of microbiology falls under this latter category. "Microbiology Because What You Don't Know Will Kill You" is about everyday people who encounter harmful organisms that we cannot see with the naked eye, yet they cause death or serious medical harm to an individual, group, or even an entire population. We cannot avoid all of these risks, but with knowledge of their existence, we can better our odds.