There’s an old test often applied by agents when presented with a book idea. Is it just a magazine article? It might seem terrible to suggest that your hard-worked on book is really just an article – but the point is that there are some stories that people want to read about in depth and others where a magazine article is really all that you can make of it and keep readers with you. The story of putting an age to the universe certainly has plenty of twists and turns along the way, so there’s is no suggestion that this just a magazine article of a story – yet we have to face up to the fact that most books on cosmology will cover this in a chapter, so David Weintraub really does have to work hard to keep us going through a chunky 363 page volume. Does he succeed? Yes and no. The first part of the book is probably the best. Here we are working up gradually, putting together the clues that will give us a best indication for an age of the universe, starting with fixing a timescale ...