We're familiar with - the flu, Zika, HIV... they've been a destructive biological force of nature that our bodies cannot contain, yet we have our own unique viruses within our bodies. They're the smallest living thing known to science, yet they wreak widespread havoc so very quickly. Carl Zimmer, popular science writer and author, writes about how they gave birth to the first few life forms, yet hold sway over our lives and bodies. It's a great science read that doesn't go over our heads - in fact, Zimmer writes in such a entertaining yet educational way that you'll leave with some extra knowledge about how your body, and viruses, works.