However much we want certainty in our lives, it feels as if we live in an uncertain and dangerous world. But are we guilty of wildly exaggerating the chances of some unwanted event happening to us? Are we misled by our ignorance of the reality of risk? Far too many of us, argues Gerd Gigerenzer, are hampered by our own innumeracy, while statistics are often presented to us in highly confusing ways. With real world examples, such as the incidence of errors in tests for breast cancer or HIV, or in DNA fingerprinting, and the manipulation of statistics for evidence in court, he shows that our difficulty in thinking about numbers can easily be overcome. This essential book illustrates how, with a few techniques, we can learn to uncloud our minds, demand helpfully presented information and turn ignorance into insight.