Abstract: The goal of this essay is to offer a brisk progress report about behaviorally informed policy and law, while also providing some conceptual clarifications. It identifies a diverse range of initiatives, focusing largely on experience in the United States, that involve nudging and uses of behavioral science. It also explores prominent objections, coming both from those who believe that nudges are unduly aggressive, and should be avoided, and from those who believe that they are too weak and timid, and should be replaced or supplemented with mandates and bans.