Hello World by Hannah Fry, subtitled ‘How to Be Human in the Age of the Machine’ looks at the role of algorithms in modern life, from our everyday internet use to the justice system to creating works of art. Most of the discussion around algorithms tends to focus on the negative impact they can have with sat navs sending drivers off the edge of a cliff and data privacy concerns being two of the most well-known examples. Fry also looks at the positive benefits of algorithms as they are undoubtedly useful in research contexts such as monitoring cell patterns in order to diagnose cancer earlier. The real-world examples of how humans interact with algorithms are concisely written and this is an engaging popular science book which is straightforward enough for a layperson to grasp as an introduction to a complex topic.