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Around the world Covid-19 has been battled bytrying to getthe publicto change how they behave: to reduce social interactions and the risks associated with them. In order to change behaviour it is not enough, however, tosimplytell people what to do. Successful interventions also need to communicate how to do it. Here I discuss the difference between nudges (influencing behaviour) and boosts (developing decison making compentencies), and Idescribethe rolethatthe publics' mental models of the pandemic play in determining theiractions. [ABSTRACT FROM AUTHOR]