PRICES MAY VARY. The book aims to provide a glimpse into the world of uncertainty evaluation through engaging examples. The examples are intended to stimulate those willing to learn more about uncertainties. The book tells stories about why the estimated mass of Pluto keeps getting smaller and smaller, how to weigh a dinosaur, or how to count unseen WW2 German tanks. There are also stories that challenge the Olympic medal assignments, dispute the authenticity of some paintings attributed to Verm