Your microbial nation: how bacteria went from menace to superfood

British science writer Ed Yong's new book I Contain Multitudes: The Microbes Within Us and a Grander View of Life is a history of gut flora and bacteria, which first entered our consciousness as a scourge to be eliminated and has lately become something between a cure-all (see the universe of "probiotic" food supplements) and a superfood (think of the fecal transplants that have shown such promise in treating a variety of debilitating and dangerous health conditions). (more")