This report represents a compendium of the many hours of effort that has gone into a remarkable public outreach effort to disseminate current, accurate information about nuclear science, it’s impact on our world and its history during the observance of Nuclear Science Week in 2021. For this year, Nuclear Science Week was offered in “hybrid” versions of programming; some held in-persons, many offered only virtually. During the 2021 year, the Delta variant of Corona Virus was prevalent and impacted how communities emerged and began to engage again. All of these changes required nimble planning and incredible ingenuity from the places where nuclear science is discussed and where work in the field takes place.

This International Impact Report has been developed to record the many places where Nuclear Science Week was observed, the groups that participated and organized these events; and the numbers of people, mostly members of the public, that participated. The year 2021 represents the twelfth anniversary of this event and annual time that NSW has been observed and the scale of it as a week for public discourse and learning continues to grow as evidenced by this report of impact. It is hoped that this report will be used to record interactions, entice larger groups to engage, to encourage more discussion, to transmit more knowledge and excite more students about nuclear science and related STEM fields as potential future career pathways. Although this report hopes to be extensive, the report cannot have captured every action taken during NSW 2021. For those that were not included, we apologize for this oversight of awareness and invite communication of exciting events that will be held at the 2022 events.