You'll learn more by doing. Try to set up some conversations with people older than yourself (15-40 years older) who don't know you well: friend or classmate's parent, relative you don't see often, etc. Practice answering questions about yourself, your activities, describing scientific research in lay terms, giving your opinion on current events related to health care, etc. face-to-face and dressed as you would for an interview. Videotape yourself in an interview setting to see if you figgit or have distracting verbal filler.