Mathematical algorithms are increasingly taking over our lives every day. Moreover: according to the author of the book, a mathematics professor and financial analyst, these algorithms have already become a dangerous weapon in the hands of the state and corporations - and these weapons are aimed primarily at the poorest and most vulnerable segments of the population. The latest mathematical applications that banks and insurance companies use to track our every move claim to be completely objective, but in fact they contain the same prejudices and biases that characterize their creators, far from perfect human beings. At the same time, the hidden principles of the operation of mathematical models and their secret criteria are protected as the greatest trade secret, and their verdicts, sometimes obviously erroneous and clearly harmful, are considered final and cannot be appealed. Welcome to the brave new world of killer Big Data!