Every day, health physicists and physicians are expected to communicate effectively with concerned people, but rarely (if ever) are they given training on how to effectively communicate. In an age of social media, this paper presents the relevance of teachings from an ancient Greek philosopher. Aristotle's Rhetoric is still considered one of the most influential works on persuasive messaging. He puts the onus of effective communications on the people with the "true" and "just" information to communicate that information clearly to the audience. By communicating with intention-using the persuasive appeals of ethos, pathos, logos, and storytelling-radiation professionals can speak to their expertise in radiation science, while adapting their instructions, presentations, and communication styles to meet the needs of each type of audience: from scientists to concerned citizens, from doctors to first responders, and beyond.