In The Geek Manifesto, Mark Henderson explains why and how we need to entrench scientific thinking more deeply into public life. Whether we want to improve education or cut crime, to enhance healthcare or generate clean energy, we need the experimental methods of science—the best tool humanity has yet developed for working out what works. Yet from the way we're governed to the news we're fed by the media, we're let down by a lack of understanding and respect for its insights and evidence. It is time to stop the nonsense and turn scientific thinking into a force our leaders cannot ignore.