What form of question is recommended by some legal commentators as an effective way to persuade a jury, while derided by others as totally ineffective? What form of question do many trial advocates utilize, but few use with knowledge of when, how, or why it is persuasive? What form of question has been established by experimental scientists to be highly persuasive in some contexts but to decrease persuasiveness in others?

It is, of course, the rhetorical question.