Famously, according to Douglas Adams, The Hitchiker's Guide to the Galaxy (not the novel, the 'actual' guide) begin by telling you at length how big space is, but then 'After a while the style settles down a bit and it starts telling you things you actually need to know' - and the opening of Ed Yong's exploration of the microbiome, the complex world of bacterial life inside us and generally in living things and around the world, is rather reminiscent of this. In the first couple of chapters, we are fed fact after fact in a staccato collection of information that has no sense of narrative or flow, rather like a set of frenzied bullet points, which becomes wearing for the reader. For example there are two paragraphs in a row, one with practically all the sentences starting 'They', and the next with almost all beginning 'We'll'. Thankfully, though, like the HHGTTG, We Are Multitude then settles down and gets on with job in hand. ...