We want to be sure - always and in everything. We don't need uncertainty. However, it is everywhere: the stock market may suddenly collapse, the climate will change, and a girl may be born instead of the desired boy. And finally, who doesn't know about the known Heisenberg uncertainty principle in quantum mechanics? Fortunately, there is also a downside to the coin. If uncertainty is used correctly, you can extract a lot of useful things from it. Throughout human history, mathematics has provided effective tools for managing uncertainty and applying it to our lives. Which ones? About this in Ian Stewart's fascinating new book For a wide range of readers.