We live in an age where information is not lacking: we are overwhelmed by it. Every day, billions of pieces of data flow before our eyes, but understanding what is true, relevant, and strategic has become more difficult than ever. Open Source Intelligence is no longer just a collection of sources: it is interpretation, inference, responsibility. Generative artificial intelligence has changed the rules of the game forever. This book takes the reader on a journey through this transformation, where the human mind and algorithmic models meet — and sometimes clash. Between neuroscience, cognitive biases, deepfakes, and synthetic evidence, a central question emerges: who really controls the analytical process? This is not a manual of tools, but a guide to thinking better in a world where artificial intelligence amplifies everything — even mistakes.