Apart from its potential as a textbook, <strong>Measuring Nothing, Repeatedly </strong> will be valuable to anyone interested in either the history of physics or the general problems of conducting experiments and evaluating their outcomes. There is a wide and variegated gap between idealized visions of scientific experiments that can be easily analyzed and the messy real-world experiments that scientists actually perform. Experimentalists must try to account for random errors, known sources of systematic error, and, most challenging of all, unknown sources of systematic error. Experimental designs that mitigate one sort of problem may amplify another. Even theorists who have neither the inclination nor the expertise to do experimental work can benefit from a finer appreciation of the problems that experimentalists confront and the sources of doubt that must accompany all empirical tests of physical theories.