Serious question: how do these experiments come into existence? E.g. the Macbeth effect or the marshmallow test? It always feels like they show very specific effects and are extrapolated to explain broad parts of the human psyche. But since there isn’t really any objective basis for creating hypotheses, I have to imagine people just sit around, think of some idea that sounds cool, and then come up with an experiment that is cheap to execute, kind of zany and memorable, and easy to swing one way or the other.