Stephen Concklin of the Adult Education Committee will lead a discussion of The Dangerous Case of Donald Trump, (Thomas Dunne Books, 2017), noon to 1 p.m. Sunday, Feb. 18, at Emerson House. Edited by Dr. Bandy X. Lee, the book features 27 psychiatrists, psychologists, and other mental health experts who argue that, in Mr. Trump’s case, their moral and civic “duty to warn” America supersedes professional neutrality. They explore Trump’s symptoms and potentially relevant diagnoses to find a complex, if also dangerously mad, man. You do not need to have read the book to attend the discussion.