Scientific Testimony concerns the roles of scientific testimony in science and society. The book develops a positive alternative to a tradition famously expressed by the slogan of the Royal Society Nullius in verba ("Take nobody''s word for it"). This book argues that intra-scientific testimony¿i.e., testimony between collaborating scientists¿is not in conflict with the spirit of science or an add-on to scientific practice. On the contrary,intra-scientific testimony is a vital part of science. This is illustrated by articulating epistemic norms of intra-scientific testimony and arguing that they are vital to scientific methodology on a par with other scientific norms governing scientific observation and data analysis. The book also provides an account of public scientific testimony¿i.e., scientific testimony to the lay population. This is done by integrating philosophical resources with empirical research on the science of science communication. For example, various misconceptions abou