Mathematician Hannah Fry and doctor and broadcaster Michael Mosley join an Imperial College, London, experiment to assess the brainpower of the nation, putting members of the public to the test in a battle of wits as they pit young and old, males and females, and tech lovers and readers against one other. The results reveal new science about how people's intelligence changes through their lives, while Hannah and Michael examine groundbreaking new science on how lifestyle and love of technology is changing the human brain.