 Abductive reasoning is not limited to everyday contexts. Quite the contrary: philosophers of science have argued that abduction is a cornerstone of scientific methodology; see, for instance, Boyd 1981, 1984, Harré 1986, 1988, Lipton 1991, 2004, and Psillos 1999. According to Timothy Williamson (2007), “[t]he abductive methodology is the best science provides” and Ernan McMullin (1992) even goes so far to call abduction “the inference that makes science.” To illustrate the use of abduction in science, we consider two examples.