 Direct experiments investigate whether a claim held (or denied) by philosophers is corroborated or falsified. This might mean investigating an intuition and whether it is as widely shared as philosophers claim, or it might mean investigating the claim that a certain behavior or trait is widespread or that two factors covary. For example, we find philosophers claiming that it is wrong to imprison an innocent person to prevent rioting; that a good life must be authentic; and that moral judgments are intrinsically motivating. Experimental research can be (and has been, as we will see below) brought to bear on each of these claims.