Scientists are not known for the graces of courtesy and tact when commenting on the work of others. - Scott L. Montgomery

How many talks have you sat through where the researcher qua [as] person just didn't show up: no anecdotes, no personal details, no emotion or enthusiasm, no humor (intentional, that is), no real contact with the audience – in other words, no performance. [...] They may satisfy the second two requirements mentioned above – accuracy and nonadvocacy – but they fail in the first and, in some ways, the most important.

If speaking to nonscientific audiences is something that interests you or will likely be asked of you, keep in mind three overriding requirements: first, you must be a human being, an interesting one if at all possible; second, you must be accurate in what you say, that is, tell the truth (about what is known and what isn't; about issues, debates, controversies); and third, if your subject is scientific knowledge, you must remain a scientist and not slip into the role of advocate or activist.