I was half way through reading ‘Sapiens: A Brief History of Humankind’ by Yuval Noah Harari on the tube the other week when a fellow commuter asked me what the book is about. Even though I have been writing reviews regularly for over five years, I still don’t enjoy being put on the spot about books I am still reading and mulling over, particularly at 8:15am on a crowded train. My initial response was to say that it’s about, well, pretty much everything. Even though that statement is fairly accurate, the expression on his face suggested that it was also quite unhelpful, so I added that it’s about how and why the human race has developed in the way that it has. This appeared to be a more satisfactory answer, which is just as well because I still can’t think of a better way to summarise its content.