Much of psychological science is about measurement. But are we any good at it? How could we do (even) better? Ruben Arslan and Farid Anvari argue that researchers often act like there was no past, inventing ever new tests without re-using, improving or even referring to what already exists. This unchecked proliferation of tests has left many subfields of psychology fragmented, as research findings are often not comparable to others. But Ruben and Farid also offer a path forward and argue that there is much to be happy about in psychological measurements—it often works surprisingly well. Listen to find out why 0.42 is (not really) a magic number and how scientific debate can inspire a rap battle. Hosted by René Mõttus.