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The world is a complex place, and data helps us understand it. Data surrounds us. They have become an essential asset, but not only for the companies that are dedicated to taking advantage of them, but also for any government, institution or person who wants to make better decisions. Whether we want to choose our children's school, study whales, sign football players or understand major social and political events, today it is essential to decipher what the numbers tell us. Almost nothing in our life life will be left out. Anything that interests, worries or seduces us can benefit from a quantitative look that is enormously revealing, valuable and often counterintuitive. In the sea of ??opinions around any news that generates debate, the voice of Kiko Llaneras stands out, who has spent years organizing, interpreting and explaining the data sensibly, with an open mind and with the greatest possible objectivity. In this generous and delightfully useful book, he reveals the tricks that allow him to analyze data in dazzling ways. On his list of tips are handy shortcuts and warnings against cheating. He teaches us to distrust our intuition, to avoid frequent mistakes and to make reliable predictions, while he tells us countless eloquent and curious cases. Why did we know that vaccines would work against covid? What caused the Chernobyl catastrophe? Why did Barack Obama sleep so peacefully? What ridiculous prejudice frustrated the signing of Marc Gasol? What is the secret of a superforecaster? Why are so many footballers born in January?