Requirements for the Cub Scout Novas and Supernova Awards have been revised. Specifically, requirement 2 of each Nova and of the Dr. Luis Alvarez Supernova, and requirement 1 of the Dr. Charles Townes Supernova Award have revised lists of rank specific adventures that the youth may earn, as well as a new option for the activities.
See the slide deck here: Cub Scout Nova Award Changes