Abstract

The state of science at any given time is characterized, in part at least, by the theories that are accepted at that time. Presently accepted theories include quantum theory, the general theory of relativity, and the modern synthesis of Darwin and Mendel, as well as lower‐level (but still clearly theoretical) assertions such as that DNA has a double‐helical structure, that the hydrogen atom contains a single electron, and so on. What precisely is involved in accepting a theory?